Filed 6/13/13 (unmodified version attached)




                         CERTIFIED FOR PARTIAL PUBLICATION


             IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA

                                   FIFTH APPELLATE DISTRICT

THE PEOPLE,
                                                                    F057722
        Plaintiff and Respondent,
                                                        (Madera Super. Ct. No. M8517)
                 v.

MICHAEL ANTONIO PIZARRO,                              ORDER MODIFYING OPINION
                                                       AND DENYING REHEARING
        Defendant and Appellant.                      [NO CHANGE IN JUDGMENT]



THE COURT:
        It is ordered that the opinion filed herein on May 21, 2013, be modified in the
following particulars:
1.      On page 102, at the end of the partial paragraph ending “perpetrator‟s sample,” the
following paragraphs are added:
               Based on this evidence, the trial court had no reason to find that
        Myers failed to follow correct scientific procedure. Accordingly, it did not
        abuse its discretion.
                       4.      Our Concerns Related to Allelic Dropout
               We recognize that we are not a scientific body, but we are
        nevertheless concerned, as was defense counsel, that allelic dropout has the
        potential to falsely incriminate an innocent defendant, which is a serious
        legal concern, as we explain below.
2.     The following sentence is added on page 102 as the first sentence of former
part II.E.5.f.3.a. (now part II.E.5.f.4.a.), under the heading “The Theory,” to read as
follows:
              The People cite Butler for the proposition that allelic dropout will
       not cause a problem if the same kit is used to test both the perpetrator‟s
       evidence sample and the defendant‟s reference sample.
3.     The sentence in the first paragraph of former part II.E.5.f.3.a. (now
part II.E.5.f.4.a.) on page 102, which presently reads as follows: “Butler and other
authors propound the theory that allelic dropout is not an issue in criminal cases when the
same primers (and PCR conditions) are used on both the perpetrator‟s evidence sample
and the defendant‟s reference sample—as long as the two samples come from the same
person.” shall now read as follows:
       Butler and other authors do propound the theory that allelic dropout is not
       an issue in criminal cases when the same primers (and PCR conditions) are
       used on both the perpetrator‟s evidence sample and the defendant‟s
       reference sample—as long as the two samples come from the same person
4.     The first sentence of the second paragraph of former part II.E.5.f.3.a. (now
part II.E.5.f.4.a.) on page 102, which presently reads as follows: “We begin with some
statements of this theory.” shall now read as follows:
              We begin with some statements of this theory, including Butler‟s.
5.     The last paragraph of former part II.E.5.f.3.d. (now part II.E.5.f.4.d.) on page 112,
which presently reads as follows: “It is our hope in discussing these issues that the
scientific community will reexamine the possible effects and management of allelic
dropout in criminal cases and determine how best to safeguard the innocent while
incriminating the guilty.” shall now read as follows:
              We recommend that the scientific community reexamine the
       possible effects and management of allelic dropout in criminal cases.
6.     Former part II.E.5.f.3.e. on pages 112 through 115 is deleted in its entirety.




                                             2.
     There is no change in the judgment. Respondent‟s petition for rehearing is denied.


                                                            _____________________
                                                                   Kane, Acting P.J.
WE CONCUR:


 _____________________
Poochigian, J.


 _____________________
Franson, J.




                                         3.
Filed 5/21/13 (reposted 5/23 to improve format of charts) (does not reflect 6/13/13 mods.)




                         CERTIFIED FOR PARTIAL PUBLICATION*


              IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA

                                    FIFTH APPELLATE DISTRICT

THE PEOPLE,
                                                                                      F057722
         Plaintiff and Respondent,
                                                                            (Super. Ct. No. M8517)
                  v.

MICHAEL ANTONIO PIZARRO,                                                           OPINION
         Defendant and Appellant.



         APPEAL from a judgment of the Superior Court of Madera County. Edward P.
Moffat II, Judge.
         Cliff Gardner, under appointment by the Court of Appeal, for Defendant and
Appellant.
         Kamala D. Harris, Attorney General, Dane R. Gillette, Chief Assistant Attorney
General, Michael P. Farrell, Assistant Attorney General, Stephen G. Herndon and
Rachelle A. Newcomb, Deputy Attorneys General, for Plaintiff and Respondent.
                                                     -ooOoo-


*       Pursuant to California Rules of Court, rules 8.1105(b) and 8.1110, only the
Introduction; Procedural Summary; Facts; the following parts of the Discussion: I., II.A.,
II.E.1.a., II.E.1.e., II.E.1.f., II.E.2.a., II.E.2.f., heading of II.E.5., and II.E.5.f.; and the
Disposition of this opinion are certified for publication.
                                     INTRODUCTION
       Tragically, in 1989, 13-year-old Amber Dawn Barfield was sexually assaulted and
murdered. In 1990, defendant Michael Antonio Pizarro, Amber‟s older half-brother, was
convicted of her first degree murder with special circumstances. In the first appeal in
1992, this court reversed and remanded for a Kelly1 hearing regarding the DNA2
evidence. On remand, the trial court ruled that the DNA testing was generally accepted
within the scientific community and reinstated the conviction. In the second appeal in
2003, this court found that the scientific evidence failed to satisfy the third prong of Kelly
and reversed the judgment. In 2008, a second jury convicted defendant of first degree
murder with a special circumstance finding. This is the third appeal in this case.
Defendant again raises challenges to the DNA evidence, contends the trial judge erred in
denying his motion for a new trial based on jury misconduct, and argues unanimity was
required on the murder theory.
       After the second trial verdicts were received and the jury had been discharged, the
parties and trial court learned that Juror No. 9 had read, during the trial, an earlier
appellate opinion in this case.3 That opinion revealed several items of information that
were not presented during the second trial, including: defendant had previously been
convicted on all counts by another jury; defendant had been sentenced to life in prison
without the possibility of parole; the appellate court‟s review of the evidence established
that defendant had consumed beer throughout the afternoon and continued to drink at a

1      People v. Kelly (1976) 17 Cal.3d 24 (Kelly) (three-prong test must be satisfied
before scientific evidence derived from new scientific procedures may be admitted).
2      Deoxyribonucleic acid.
3      The opinion Juror No. 9 read was actually an opinion issued in August 2002 that
was later vacated after this court granted rehearing. It subsequently issued its opinion in
2003 (People v. Pizarro (2003) 110 Cal.App.4th 530 (Pizarro II), disapproved on other
grounds in People v. Wilson (2006) 38 Cal.4th 1237, 1250-1251). There is no substantive
difference between the two opinions as it relates to the jury misconduct issues.



                                               2.
party; defendant testified at his first trial in which he contradicted portions of his
statement to the police and admitted that “alcohol made him violent”; the Federal Bureau
of Investigation (FBI) analysis presented at the first trial concluded that the DNA from
the semen on the vaginal swabs matched the known blood sample of defendant; the case
had been appealed twice; and the appellate court determined that the evidence against
defendant was a “„strong circumstantial case‟” and that the DNA evidence clearly
“„“sealed [his] fate.”‟” (Pizarro II, supra, 110 Cal.App.4th at pp. 553, 634.)
       During the second trial, the trial judge regularly admonished the jury not to
consider anything other than the evidence presented in the courtroom. Juror No. 9
repeatedly violated that instruction during the trial. The parties and the trial court agree
that Juror No. 9 committed misconduct. They disagree whether that misconduct
amounted to juror bias, warranting a new, and third, trial.
       We sympathize with the trial judge who, having presided over two jury trials and a
prolonged Kelly hearing amid two appeals, was called upon to make the difficult decision
of whether to grant yet another new trial in a case that was then almost 20 years old. The
trial court ultimately denied defendant‟s new trial motion, finding it to be a “close case”
and a “real hard, hard decision to make.” While we agree with the trial judge that the
juror misconduct in this case amounted to “gross misconduct” and was “absolutely
outrageous,” we disagree with his decision denying the new trial motion. We conclude
that reversal is required. Despite the good efforts of the trial judge and the attorneys to
conduct the trial in accordance with the rules of evidence, procedure, and substantive law,
the juror‟s misconduct in disobeying the court‟s repeated admonitions and in
investigating the case on his own made a mockery of the trial process and prejudiced
defendant. We view that juror‟s behavior in this case as criminal.4

4      Juror No. 9 arguably violated Penal Code section 96 (juror commits felony if he or
she willfully and corruptly receives information except according to the regular course of
proceedings) and could have been criminally prosecuted for his misconduct. (See In re


                                               3.
       We conclude that the extraneous material (the appellate opinion) read by Juror
No. 9, judged objectively, is inherently and substantially likely to have influenced the
juror, warranting a new trial. Accordingly, we reverse the conviction.
       We are mindful of the burdens—in terms of time, money and proof —of any
prospective retrial of this case involving an awful crime that occurred 24 years ago. In
this third appellate opinion on a case that has been twice tried, we take no satisfaction in
the decision we unavoidably must render, in accord with our duty, as a consequence of a
juror‟s outrageous misconduct that undermines the soundness of a verdict in our system
of justice.
       Although we uphold the admission of the DNA evidence, we conclude that the
widely held belief that allelic dropout cannot cause false results in a criminal case as long
as the defendant‟s and the perpetrator‟s DNA samples are tested in a consistent manner is
based on the improper assumption that the defendant is the perpetrator—in other words,
that the defendant is guilty. We determine in this case, however, that any error was
harmless.
                              PROCEDURAL SUMMARY
       On August 11, 1989, the Madera County District Attorney charged defendant as
follows: count one, first degree murder (Pen. Code, § 187) with the special


Carpenter (1995) 9 Cal.4th 634, 673 (Mosk, J., dis. opn.) (Carpenter).) We believe a
juror who so brazenly disregards and willfully violates the court‟s admonition not to
investigate or consider matters outside the evidence received in the courtroom should be
criminally prosecuted. Jurors take an oath to follow the court‟s instructions. When a
juror knowingly disobeys a court order, he or she should be held accountable. We
recommend that the Advisory Committees on Criminal Jury Instructions and Civil Jury
Instructions include in their Pretrial Instructions a reference to Penal Code section 96 to
impress upon jurors the seriousness of their task and the importance of obeying the
court‟s instruction not to investigate the case or consider matters other than the evidence
received in the courtroom. One wonders if Juror No. 9 would have committed this
misconduct if he was told it could subject him to criminal prosecution.



                                             4.
circumstances that the murder was committed while defendant was engaged in the crime
of rape (Pen. Code, § 190.2, subd. (a)(17)) and while he was engaged in the crime of a
lewd or lascivious act upon a child under age 14 (Pen. Code, § 190.2, subd. (a)(17));5
count two, forcible lewd or lascivious act on a child under age 14 (Pen. Code, § 288,
subd. (b)); and count three, forcible rape (Pen. Code, § 261, subd. (2)). Defendant pled
not guilty.
       In 1990, a Kelly hearing was held to determine the admissibility of the results of
DNA identification evidence. The trial court ruled the results were admissible.
       The jury found defendant guilty on all counts and found true the special
circumstances. The trial court sentenced defendant to life in prison without the
possibility of parole on count one, to be served consecutively to the upper term of
eight years on count two. The sentence on count three was stayed pursuant to Penal Code
section 654.
       On appeal, we remanded the case to the trial court for a full-blown Kelly hearing
to determine the general scientific acceptance of the FBI‟s DNA profiling procedure and
the FBI‟s Hispanic database. (People v. Pizarro (1992) 10 Cal.App.4th 57, 95-96
(Pizarro I).) In March 1998, after a hearing conducted in 1994 and 1995, the trial court
found the procedure and the database generally accepted and the evidence admissible.
Defendant appealed. In 2002, we published an opinion reversing the judgment. We


5       In 1989, Penal Code section 190.2, subdivision (a)(17) provided: “(a) The penalty
for a defendant found guilty of murder in the first degree shall be death or confinement in
state prison for a term of life without the possibility of parole in any case in which one or
more of the following special circumstances has been charged and specially found under
Section 190.4, to be true: [¶] … [¶] (17) The murder was committed while the defendant
was engaged in or was an accomplice in the commission of … the following felonies: [¶]
… [¶] (iii) Rape in violation of Section 261. [¶] … [¶] (v) The performance of a lewd or
lascivious act upon [the] person of a child under the age of 14 in violation of
Section 288….”



                                             5.
granted rehearing, and then in 2003, we published a final opinion in Pizarro II, supra,
110 Cal.App.4th 530, reversing the judgment.
       In 2008, a second jury found defendant guilty on count one, first degree murder
with the special circumstance that the murder was committed while defendant was
engaged in the crime of a lewd and lascivious act, but the jury found not true the special
circumstance that the murder was committed while defendant was engaged in the crime
of rape. The jury found defendant guilty on count two, forcible lewd or lascivious act on
a child under age 14. On count three, the jury found defendant not guilty of rape, but
guilty of the lesser included offense of statutory rape.
       Defendant unsuccessfully moved for a new trial. The trial court sentenced
defendant to life without the possibility of parole on count one, a stayed eight-year term
on count two, and a stayed three-year term on count three. Defendant appealed.
                                          FACTS
       On June 10, 1989,6 defendant and his wife, Sandy, both about 20 years old, and
their five-month-old baby drove to North Fork from Clovis in their white Toyota pickup
truck to visit defendant‟s mother, Chris Conston, and his sisters.7 Defendant and Sandy
did not visit North Fork often; as far as Sandy knew, defendant had not been there in the
several weeks prior to this visit, and the last time she had been there was in late 1988.8
The drive to North Fork took about 45 minutes and they arrived at Chris‟s house around
noon. Defendant‟s sisters, Gloria, Amber, and Angie, who still lived at home, were there,
as well as Gloria‟s boyfriend, Billy, who was about 17 years old. After they visited for a

6      All references to dates are to 1989 unless otherwise noted.
7      Defendant and Sandy married in September 1987 and divorced in October 1997.
8      Defendant worked at a lumber mill in Auberry, about 30 minutes from home in
Clovis. If he was working on a Saturday, he would stay in Auberry after work on Friday
and come home after work on Monday. Sandy did not remember his being gone from
home during the week prior to June 10.



                                              6.
while, everyone went to the elementary school to watch the men play basketball. Sandy
knew defendant and other people were drinking because they were “just overly happy.”
After the basketball, they returned to the house. During the remainder of the day,
defendant left the house three times without Sandy. He did not tell Sandy where he was
going, but she assumed he was going to the store. After his third trip, he told Sandy his
friends were going to a party and he wanted to go. Sandy told him she wanted to go
home, but they ended up going to the party at Shady Oak trailer park a few miles up
Road 200, which was a two-lane mountain road with lots of trees, steep embankments,
and no streetlights.
       When Sandy and defendant arrived at the party, Amber, Gloria, and Billy were
already there. In total, there were about eight people at the party, one of whom was Scott
Nelson. Sandy talked with Amber while defendant drank beer and hard liquor with his
friends. Sandy did not drink much because she was nursing the baby. She may have had
one-half of a beer. She was not happy to be there. She thought defendant seemed to be
handling his alcohol “okay.” He was a regular drinker and she had seen him in various
stages of intoxication in the previous couple of years.
       At about 10:00 or 10:30 p.m., Amber left the party with Billy and Gloria. Sandy
asked defendant to leave, but he refused.
       At about 12:30 a.m., Sandy took the baby and left for home in the truck. She
drove only a few minutes to Bass Fork Market, then decided she did not want to drive by
herself, so she returned to the party. Defendant came outside and they argued for five or
10 minutes about going home. Defendant went back inside for about 20 minutes and
came back out around 1:00 a.m.
       Defendant was angry with Sandy and he started walking toward Road 200, which
was about 100 feet away from the trailer. He told Sandy he was going to his mom‟s. He
had been drinking, but he was not staggering, falling down, or slurring his words. Sandy
got into the truck with the baby and followed defendant down the road toward North

                                             7.
Fork. He was zigzagging across the road, walking from one side to the other and hiding
behind trees and rocks. He appeared to be hiding from Sandy. At one point, he ran up an
embankment on the side of the road, then back down to the road. Eventually, he started
running on the road. He hit the hood of the truck and told Sandy not to stop in the middle
of the road. As she followed him, she yelled at him to get in the car. She told him she
just wanted to go home. Sandy had seen him intoxicated before, but she had never seen
him act this way. This continued for more than 15 minutes, until Sandy gave up and
drove into North Fork to Chris‟s house. She knocked on Chris‟s front door and
eventually Amber opened the door. Sandy told her defendant was “out there” and she
could not get him in the truck because he did not want to come. Amber said, “[W]ell,
let‟s go get him.” Sandy told her to ask her mom. Amber left and returned with Chris,
who gave Amber a turquoise flashlight and told them to be careful.
      Amber got in the truck and held the baby. Sandy drove back to the place she had
last seen defendant. When they saw him walking, Sandy made a U-turn. They followed
him and told him to get in the car, but he refused. He went up a hill and Sandy shined the
flashlight on him. He came down and started running. Amber got out of the truck and
set the baby on the seat, leaving the door slightly open. Sandy saw Amber in the
headlights as she walked across the road toward defendant. Sandy picked up the baby
and pulled the door closed. She followed Amber for about 10 seconds. After that,
defendant and Amber disappeared. Sandy never saw Amber again.
      Sandy drove forward. She held her door open as she yelled for defendant and
Amber because the driver‟s window was not operable. She heard nothing. It was dark
and she could see nothing other than what her headlights illuminated. She yelled for
defendant and Amber to turn on the flashlight, flash the light, or do something. Then she
saw a flash of light behind a bush. The light pointed upward. Sandy closed her door,
pulled forward, and made a U-turn. She stopped in front of the bush and yelled. She was
holding the baby, so she could only yell from her open door, which was now on the

                                            8.
opposite side of the truck from the bush. There was no response and no more light, so
she pulled forward, made another U-turn, and returned to the spot where she had seen the
flash of light. She parked, opened the door, and yelled for defendant and Amber. She
heard “a scream, a muffled sound, and nothing else.” It was as if someone put a hand
over a mouth. It scared her and “[f]reaked [her] out.” She closed her door and
immediately drove back to Chris‟s house. She told Chris, “I don‟t know what happened.
I heard a scream, a muffled sound. I‟m scared. I don‟t know what‟s going on.” Chris
told her to come in and they called the sheriff‟s department. Deputy Loring was on duty
that night and he received the call around 2:50 a.m.
       Sandy drove to Sierra Automotive at the intersection of Roads 200 and 222 to
meet the deputies. Deputy Loring and Deputy Weisert arrived and met Sandy in the
parking lot. Sandy was sitting in the white truck with the baby and she seemed upset and
frightened. She told them what had happened and they began searching for defendant
and Amber. Sandy‟s parents came from Fresno to take her home. Sandy left the white
truck at Chris‟s house.
       Just before 6:00 a.m., defendant arrived back at Chris‟s house. At about 6:00 a.m.,
defendant called Deputy Weisert at the station. According to Deputy Weisert, defendant
did not seem intoxicated. He said his sister was missing. He explained that he got into
an argument with Sandy. His sister came looking for him and he told her he did not want
to talk about it. He took off up the hill with her flashlight. She yelled at him about the
flashlight and he threw it down the hill. He did not go back down, but later woke up in
the bushes and started walking home. As he did, “some cops came upon him and accused
him of kidnapping his sister. And then … he basically ran home and was followed by the
cops.” He did not describe these cops to Deputy Weisert. But she and Deputy Loring
had been the only officers on duty that night, and after Deputy Loring left around
4:00 a.m., Deputy Weisert was the only officer on duty. The next officer would not come
on duty until 6:45 a.m. In Deputy Weisert‟s opinion, defendant was telling her a story

                                             9.
that could not be true. She knew that no other officers were on duty in the area and that
they would not have known about the case anyway.
       At about 8:00 a.m., Deputy Lidfors went to Chris‟s house to speak to defendant.
He was asleep, so Deputy Lidfors asked Chris to wake him up. When they spoke,
defendant did not seem intoxicated or hung over; nor did he smell of alcohol. Defendant
looked as if he had just woken up from sleeping out in the brush. He was wearing the
same clothes he had worn the previous night, a white tank top and black and grey
Oakland Raiders shorts. He was dirty and there were “stickers, grass stuff sticking off of
his shorts.” Defendant told Deputy Lidfors what had happened. When Deputy Lidfors
asked defendant if he could give him a description of where he had last seen Amber,
defendant directed him to a specific area on the side of Road 200.
       Relying on that information, at about 8:30 a.m., officers found Amber‟s body
about 16 feet from the shoulder of Road 200.9 The area was a mixture of grass and
weeds with a lot of dirt. The grass was trampled down. Amber was nude below the
waist, except that she was still wearing short dark socks. Her blue panties were down
around her right ankle. Much of her body was covered in foxtails. Her right sock had
foxtails on the ball and toe portion, and a large amount of dirt caked onto the heel, as if it
had been dug into the dirt. The other sock had foxtails and some dirt on it. A turquoise
flashlight was near her right foot. Her tan T-shirt and bra were both pushed up over her
breast. Her right cheek was bruised and marked. Blood was smeared along her stomach,
down her inner left thigh, across her right thigh, and on her right wrist. Her hands were
clutching a large amount of dirt, grass, and foxtails. Her pants and shoes were under
some brush near her body.


9       Earlier that morning, officers had not found Amber‟s body because Sandy
mistakenly directed them to an area about one-tenth of a mile from the area she had seen
the flashlight go on.



                                             10.
       Detective Kern found evidence of activity only in the area where Amber was lying
and in an area of dirt slippage on the embankment between the roadway and Amber. He
found no evidence of activity either behind the crime scene up to the six-stranded barbed
wire fence or on the other side of the barbed wire fence. Other than the dirt slippage area,
he found no evidence of any entry to or exit from the crime scene.
       Gary Cortner, a senior criminalist, and Richard Kinney, a latent fingerprint
analyst, both from the Fresno lab of the California Department of Justice (DOJ), arrived
to help Detective Kern process the crime scene.
       At about 10:00 or 10:30 a.m., Sergeant Gauthier spoke to defendant at the station.
The knuckles of defendant‟s right hand were somewhat red and there were some very
minor scratches on one of his shoulders.
       Around 1:30 p.m., Amber‟s body was removed from the scene and taken to the
mortuary.
       At about 2:00 or 2:30 p.m., Sergeant Gauthier took defendant back to Chris‟s
house. As they drove on Road 200, defendant pointed to the crime scene area as the last
place he had seen Amber.
       Sandy returned to North Fork to talk to defendant at Chris‟s house. She noticed
that one of his hands was bruised and swollen. Defendant often injured his hands at
work, but she had not noticed this injury the previous day.
       At about 4:00 p.m., Dr. Dalgleish, a pathologist, performed the autopsy on
Amber‟s body at the mortuary.10 He noted that the right side of Amber‟s face was
bruised, most likely from blunt force trauma. In the middle of a prominent bruise below
her eye was a small puncture wound, which might have been a source of external
bleeding. These injuries were consistent with blunt force by a hand or a flashlight,
although some of the injuries could have been caused by falling. She had bruising around
10     Dr. Dalgleish testified as an expert in pathology.



                                            11.
her mouth and nose. Amber also suffered an internal hemorrhage in the scalp on the right
front of her head, but no fractures of the skull or injuries to the brain. This scalp
hemorrhage was consistent with blunt force by a fist or a flashlight, and could have dazed
or disoriented Amber. These injuries were less than one day old and were all inflicted
before death, but they were not fatal.
       Amber‟s external genitalia showed no sign of injury. Her hymen was open,
demonstrating some sort of sexual activity at some time prior to her death. It was
impossible to determine when that had occurred. Her uninjured condition did not suggest
that she had not been sexually assaulted, but only that any sexual assault was not
aggressive enough to cause injuries.
       Internally, Amber‟s neck area showed petechial hemorrhages, consistent with
asphyxia hypoxia. There was no evidence of strangulation and no foreign material
blocking the airways. Her lungs also suffered petechial hemorrhages, which resulted in
congestive edema.
       Dr. Dalgleish collected vaginal and rectal swabs and made slides from them. He
allowed the swabs to dry for about two hours and 45 minutes, upright, separate from each
other, and away from the body. He took blood samples from the large vein around the
heart and put them in clean, sterile containers. He took scrapings from the dried blood
smears on Amber‟s body and placed them in a plastic vial. The samples were placed in
the victim sexual assault kit. Amber‟s blood tested negative for drugs and alcohol.
       Dr. Dalgleish determined that Amber‟s death was caused by suffocation leading to
asphyxia hypoxia. He believed the bruising around her mouth indicated pressure, such as
from a hand over her mouth and nose, that prevented air from entering her airways.
Generally, suffocation requires about five minutes of complete oxygen deprivation to
cause irreversible brain injury. This would require a steady application of pressure.




                                             12.
Based on the state of rigor mortis, he estimated her death as occurring about 10 to
14 hours before the autopsy.11
       On June 13, Detective Kern returned to Chris‟s house. He advised defendant of
his Miranda12 rights and defendant agreed to speak to him. After taking defendant‟s
statement, Detective Kern and defendant drove to the crime scene. Defendant pointed
out a tree about 150 yards from the crime scene where he had tried to hide when Sandy
first brought Amber back to talk to him. Then he stopped Detective Kern at the side of
the road adjacent to the crime scene. He pointed exactly to the crime scene and said it
was where he spoke to Amber. He said he entered the area through the dirt slippage area.
Defendant explained that after he and Amber finished talking, she wanted the flashlight
back. He threw it to her, then turned and ran in the opposite direction of the roadway.
The route he indicated would have been right through the barbed wire fence, which he
did not mention. This was an area Detective Kern had searched and found no evidence of
activity. Detective Kern then drove defendant to the area he said he went to sleep in the
brush. Defendant said he ran straight from the crime scene through an open field and
over a hill. He next showed Detective Kern the specific area that he spent the night.
Detective Kern got out and examined the ground for about 50 yards, but found no tracks
in the dirt, on the embankment, or on the roadway. He went to the top of the hill and
examined a large area, but found no evidence that anyone had been there recently.
Defendant had no response; he seemed not to remember where he had been.




11     The defense expert agreed Amber‟s cause of death was most probably suffocation
due to manual obstruction of the mouth and nose, probably by a hand. It was not due to
her face being pushed into the ground because there would have been marks around the
mouth and nose that were not present.
12     Miranda v. Arizona (1966) 384 U.S. 436.



                                            13.
1989 Lab Analysis
       The physical evidence was immediately analyzed at the Fresno DOJ lab. (After
analysis by the DOJ, described below, the vaginal swabs were sent to the FBI for
Restriction Fragment Length Polymorphism (RFLP) DNA analysis. That DNA evidence
was introduced in the first trial and discussed at length in Pizarro II (and the opinion read
by Juror No. 9), but it was not mentioned in the second trial. The following testimony
regarding what was done in 1989 was elicited at the second trial.)
       Delia Frausto-Heredia received the victim sexual assault kit on June 12.13 She
examined the vaginal swab first, as was her practice. She examined only one of the four
vaginal swabs, all of which were initially in an envelope together. She used good lab
practices, including the use of gloves and sterile instruments, and she worked with this
evidence only. The vaginal swab tested positive for the presumptive presence of sperm.
Frausto-Heredia saved the remainder of the vaginal swab to ensure that the defense could
reanalyze it.
       Frausto-Heredia determined from the blood samples that Amber was a type O, a
non-secretor, and a two plus one plus for phosphoglucomutase (PGM). Defendant was a
type B, a secretor, and a one plus one plus for PGM. The PGM result of the blood
scrapings from Amber‟s leg was consistent with Amber‟s own blood sample.
       Stephen O‟Clair, a senior criminalist, determined that the sperm on the vaginal
swab was type B and therefore defendant was included as a possible donor.14 About
10 percent of the general population are type B, and about eight percent are both type B
and a secretor. O‟Clair also used good lab practices and safeguards against
contamination.



13     Frausto-Heredia testified as an expert in serology.
14     O‟Clair testified as an expert in ABO blood typing.



                                             14.
       On June 13, Cortner examined the slides from the victim sexual assault kit.15 He
found about 20 to 25 sperm on a slide, along with some bacteria that were streaked with
the sperm.
       When Cortner examined photographs of the bruises on Amber‟s face, he observed
some parallel lines fairly close together and wondered what could have made that pattern.
He noticed that the turquoise flashlight‟s button had lines running across it and the word
“Eveready” in the center. Cortner made an impression of the flashlight‟s button in clay
and determined that the button could have caused the mark.
       In Amber‟s pubic hair sample, Cortner found none of defendant‟s pubic hairs.
Similarly, in defendant‟s pubic hair sample, he found none of Amber‟s pubic hairs. In
about 50 percent of sexual assault cases, Cortner observed a lack of pubic hair transfer
between victim and perpetrator.
       On June 19, seven days after she examined the vaginal swab, Frausto-Heredia
examined defendant‟s underwear. The underwear and the vaginal swab were never on
the lab bench at the same time, and the disposable work surface was changed between
each piece of evidence. The underwear tested negative for semen. Amber‟s panties also
tested negative.
       On June 22, Cortner examined defendant‟s shorts and found two foxtails on the
outside and nine foxtails on the inside. Defendant‟s underwear contained eight foxtails
on the outside, four in front and four in back.
       Kinney found no fingerprints on the flashlight.
2004-2008 Lab Analysis
       Many years later, in preparation for the second trial, Steven Myers, a senior
criminalist at the Richmond DOJ lab, reexamined the evidence using Short Tandem


15     Cortner testified as an expert in criminalistics and general forensic analysis.



                                             15.
Repeat (STR) DNA analysis.16 Myers determined that defendant‟s DNA profile matched
the DNA profile of the sperm on the vaginal swab. Defendant was included as a possible
sperm donor.17 The estimated frequency of the profile (shared by both defendant and the
evidentiary sperm), or the chance that a randomly chosen person would have that profile,
was approximately one in 3.9 quintillion African-Americans, one in 350 quadrillion
Caucasians, and one in 4.2 quadrillion Hispanics.18 In other words, the frequency of the
profile was exceedingly rare.
       Myers found that the DNA profile of the epithelial cells on the vaginal swab was
consistent with Amber‟s profile. He also determined that the DNA profile of the blood
smeared on Amber‟s body was consistent with her own profile.
       Myers tested blood from Scott Nelson, collected on June 22, 1997, and from
Scott‟s father, collected on March 21, 2007. Their profiles did not match the sperm on
the vaginal swab and they were excluded as sperm donors. Their profiles also did not
match the blood on Amber‟s leg.
Defense Evidence
Sandy Panico
       Sandy testified that when she and defendant left the party, defendant seemed
intoxicated. She had seen him that drunk before, but she had never seen him act the way
he did that night.




16     Myers testified as an expert in forensic DNA analysis and statistical DNA
analysis.
17    Myers found it implausible that an analyst had contaminated the vaginal swab with
semen. He had never seen transfer of that amount of sperm by contact.
18     One quadrillion is one followed by 15 zeros, and one quintillion is one followed
by 18 zeros.



                                           16.
Kathleen Christine Conston
       Chris testified that when Sandy came back to the house the second time at about
2:00 a.m. with only the baby, she was hysterical, upset, and scared. Sandy said she could
not find Amber, she was gone, and she had screamed. Chris made her come into the
house. Chris called the police and then they left in separate vehicles. Sandy drove the
white truck and Chris took her vehicle.
       Chris testified that defendant returned to her house just before 6:00 a.m. He had
scratches that appeared to be from going through brush. He told Chris he had spoken to
Amber and then he took off, and on his way home, a policeman accused him of
kidnapping his sister. Defendant did not change his clothes because he had not brought
any extra clothes. When he woke up, he had “the mother of all hangovers. In fact, he
was still kind of drunk.” Later, when he found out Amber had been killed, he cried. He
was devastated because he and Amber were “extra close.” The news “hit him pretty
hard.” Defendant stayed in North Fork after Amber‟s death and continued to work. He
was a pall bearer at Amber‟s funeral. Two weeks later, he was arrested at work.
       Chris thought Scott Nelson came to her house on June 11. He drove a white
pickup truck.
William Davis
       William Davis had lived in North Fork most of his life. In 1988, he saw defendant
and Scott at a Halloween party. They were both dressed in deputies‟ uniforms. Scott was
pulling a gun in and out of a holster.
       William testified that he was familiar with trails that led from the area of the crime
scene back into North Fork.
       William agreed that he and defendant were “real good friends” and “[b]est
buddies.” They had known each other since grade school and they hung out together a
lot, but William would not lie for defendant.



                                            17.
Betty Lyons
       Betty Lyons was driving on Road 200 at about 2:00 a.m. on June 11. She came
upon a tan Datsun pickup truck parked off to the side of the road. The truck‟s doors were
closed and she did not see anyone inside. At a later time, Betty saw the same tan truck
parked in front of Chris‟s house during the daytime.
Gena Fabris
       Gena Fabris was driving on Road 200 sometime between midnight and 2:00 a.m.
She noticed a small white pickup truck, like a Toyota, parked on the side of the road. She
slowed to about 40 miles per hour as she passed it. The truck‟s lights were off and the
doors were closed. She did not see anyone. When she drove by again five to 15 minutes
later, the truck was still there. She still did not see anyone.
Guy Clements
       Guy Clements was delivering newspapers that morning on Road 200. At about
3:00 a.m., he saw a small white pickup truck and a sheriff‟s vehicle near Sierra
Automotive. The white truck had the body style of a 1970‟s Datsun. West of the crime
scene, he saw a second pickup truck that looked like a 1984 Nissan.
William (Billy) Bain
       Billy was with Gloria at Chris‟s house on June 10. He and defendant had a few
beers during the day. They went to the party that night and drank some more. There was
marijuana at the party, but Billy did not recall if defendant was smoking it. Scott was at
the party and he was getting loud. He was a braggart who liked to drink. He always tried
to arm-wrestle Billy every time they saw each other because Gloria was his old girlfriend.
That was the reason Billy and Gloria left the party around 10:00 p.m. Billy remembered
that Scott drove a small white Dodge truck. Billy never heard Scott confess to a crime.
Gloria Bain
       Gloria testified that defendant had one beer at the school on June 10. At the party
that night, there was drinking. It was a normal occurrence for this group of people to

                                              18.
smoke marijuana, but she could not recall if they did that night. Scott kept asking to arm-
wrestle, which was his normal behavior. When Scott came to Chris‟s house the next day,
he parked his white Dodge truck in the driveway. Defendant‟s truck was also in the
driveway.
Sergeant Gauthier
        Sergeant Gauthier did not see any blood on defendant‟s hands, body, or clothes.
He did not swab defendant‟s hands or take fingernail scrapings. He took the samples
required for a possible sexual assault.
Sherri Atkisson
        Sherri Atkisson met Scott in June 1997. One day, they were talking with some
other people. Scott consumed two beers. He seemed depressed and he said some
alarming things. He said, “I killed her, not her brother, Mike.” He said Mike did not do
it. He did not mention the female‟s name. He said he was driving down the street and he
passed her. She was in pajamas. He stopped, she ran into a field, and he chased her. He
had to keep her quiet because she was going to reveal that they had been having sex.
Another car was coming and he was trying to keep her quiet. Scott said she died, but he
did not explain how. About a week after this conversation, Sherri heard that Scott had
died.
        When this conversation occurred, Sherri did not know defendant, Chris, or any of
their family members. She had since met defendant‟s family in the courthouse hallways.
        On cross-examination, Sherri explained that Scott had been to her home several
times, but she did not know him very well. She agreed that she did not know if Scott had
been drinking before he came to her house on that particular day. When Scott mentioned
pajamas, he did not mention the clothes Amber was wearing when she died. Noel
Bartley was present and able to hear everything Scott said. Sherri denied that the only
thing Scott said was, “I should just choke you out, too,” and she denied that she and her
friends later concluded Scott must have been referring to Amber.

                                            19.
       After Sherri heard Scott‟s statements, she contacted the Madera County District
Attorney‟s office and reported that someone had admitted a murder to her. She requested
a return call, but no one ever called her back. In 2007 and 2008, however, she refused to
talk to state agents who asked to speak to her about Scott‟s alleged statement.
                                       DISCUSSION
I.     MISCONDUCT OF JUROR NO. 9
       A.     Introduction
       This was an awful case on many levels: an abominable crime with complicated
DNA evidence, two jury trials and a lengthy Kelly hearing in between. And if that did
not present enough challenges, the second trial was fraught with allegations of jury
misconduct committed by different jurors during the presentation of evidence and during
jury deliberations. We need not discuss all of these allegations, because we find Juror
No. 9‟s flagrant misconduct in reading this court‟s 2002 appellate opinion in this case
sufficient to warrant reversal of the conviction.19
       B.     Juror No. 9’s Misconduct
       Juror No. 9 testified at the new trial motion hearing. He admitted that at the
beginning of testimony in the trial, he went onto the Internet, researched the case and
found a prior appellate opinion in this case. That opinion revealed: defendant had
previously been convicted on all counts by another jury; he had been sentenced to life in
prison without the possibility of parole; on the day of the killing he had consumed beer
throughout the afternoon and continued to drink at a party; he testified at his first trial in
which he contradicted portions of his statement to the police and admitted that “alcohol

19     Juror No. 9 also committed misconduct when he discussed this case with two
neighbors during the trial. He also failed to divulge his prior criminal conviction during
voir dire. The trial judge dismissed and replaced another juror for improperly discussing
sentencing matters during deliberations. There were also allegations that “bullying” of
jurors occurred in the jury room.



                                              20.
made him violent”; the FBI analysis presented at the first trial concluded that the DNA
from the semen on the vaginal swabs matched the known blood sample of defendant; the
case had been appealed twice; and the appellate court determined that the evidence
against defendant was a “„strong circumstantial case‟” and that the DNA evidence clearly
“„“sealed [his] fate.”‟” (Pizarro II, supra, 110 Cal.App.4th at pp. 553, 634.)
       In one part of his testimony at the hearing, Juror No. 9 said that he read the entire
opinion a few times; in another part of his testimony, he said that he only skimmed
portions of it; and in yet another part, he said he “soaked in” whatever he could
understand of the opinion. Specifically, he explained that he conducted this Internet
research two or three times. He “researched the case during the testimony phase of the
trial. [H]e found the process of researching the case to be quite simple and detailed
information of the case to be readily available through the Internet.” As the testimony
began, “[he] was lost. And that was really [his] reasoning to try and find to know where
[he] was within the case.” He “felt that [he] wanted to do what was right for
[defendant‟s] case and understand what was going on within the case. So that was the
reason why [he] had pulled up some information, which turned out to be the very thick
PDF file [the prior appellate opinion], to understand how the series of events had
happened.” He “just wanted to understand the timeline[ and] the series of events of the
case so [he could] understand so [he could] be on top of stuff while [he was]
listening .…” He first read a current newspaper article about the case explaining it was
an early DNA case for California courts and it was back in court. Then he turned to the
prior appellate opinion, which “was so thick that it took [him] a long time.” He did not
pay much attention to the other items produced by his Internet search because the prior
appellate opinion gave him the “information [he] needed to know what was going on.”
He downloaded the prior appellate opinion and kept it on his computer for about three
weeks. He explained:



                                             21.
               “[I]nitially, … I just wanted to see it and when I seen that it had
       the—the timeline … [h]ow the timeline played out then that helped me out
       a lot. So I read all the way through from start to finish and that kind of
       gave me an overview to stay caught up with what you guys, in my opinion,
       what you guys were saying. I‟m sure you guys were doing a good job, but I
       guess I‟m slow. [¶] … [¶] No, [I did not read through the entire
       document;] when I got to the DNA stuff and markers and the alleles and all
       that it didn‟t … make sense at that time.”
       He said he would refer back to the prior appellate opinion when questions arose in
his mind and he would attempt to clarify them. He mostly wanted to clarify the timeline.
He said, “[I]t was mostly just facts that I was sticking to.” When asked if he read the
portion of the facts that explained defendant‟s testimony in the first trial, he answered,
“Oh, okay, yeah. No, I read everything to where it started getting really technical, like
the DNA, the extractions of DNA, and the markers. I didn‟t understand the theory and
stuff like that. But, uh, yeah, I did read this.” In reference to defendant‟s testimony, he
explained:
              “I was looking at everything. I was looking at what people were
       saying, who said what. I was looking at who was where. I mean, that‟s
       timelines, that‟s what a timeline is. Where everybody was at. What they
       were saying. Who was involved. I mean, that‟s—that‟s what I was—and
       when it stop[ped] talking about stuff like that, and then it start[ed] going
       into theories and DNA markers and everything that I didn‟t understand, I
       stopped.”
       He said he just skimmed the DNA and “pulled out whatever [he] could
understand, but most of it” did not make sense to him. He did, however, learn that the
FBI was involved in analyzing the DNA evidence.
       When asked again if he read the prior appellate opinion from beginning to end, he
answered: “Oh, absolutely. I mean, what I could understand I soaked in.”
       The prior appellate opinion contained information that was not disclosed in the
second trial. It was also highly prejudicial to defendant, as we explain in more detail later
in this opinion. There can be little doubt that if, during jury selection, Juror No. 9
disclosed he had read the prior appellate opinion in this case, he would have been


                                             22.
immediately excused for cause. In our view, if this disclosure had been revealed to the
court during the trial, and the defense thereafter moved the court to discharge him, the
trial judge would likely have done so. Here, in contrast, the disclosure occurred after the
verdict, where the controlling question was whether the juror was actually or inherently
biased. (Carpenter, supra, 9 Cal.4th at p. 653.)
       The parties agree that Juror No. 9 committed misconduct in consulting an
extraneous information source and that prejudice is presumed unless rebutted. Defendant
argues that the record establishes both actual and inherent bias on the part of Juror No. 9.
The People dispute that actual bias against defendant was shown. As to inherent bias,
they both cite cases in support of their respective positions that the presumption of
prejudice was or was not rebutted.
       Actual bias does not require a showing of prejudice before a verdict will be set
aside, because a defendant is entitled to 12 unbiased jurors, not 11, regardless of whether
an unbiased jury would have reached the same verdict. (Carpenter, supra, 9 Cal.4th at
p. 654.) On the other hand, a finding of inherently likely bias carries a presumption of
prejudice that may be rebutted by an affirmative evidentiary showing or by a reviewing
court‟s examination of the entire record. (Id. at p. 657.) The presumption is imposed
because Evidence Code section 1150 precludes a defendant from affirmatively proving
that the jury‟s deliberations were improperly affected by the misconduct. Since actual
prejudice cannot be proven, bias is established if the extraneous material, judged
objectively, is inherently and substantially likely to have influenced the juror.
(Carpenter, supra, at pp. 652-653.) We conclude that is what happened here.
       C.     Standard of Review
       Whether prejudice arose from jury misconduct is a mixed question of law and fact
subject to an appellate court‟s independent determination. (People v. Nesler (1997) 16
Cal.4th 561, 582-583 (Nesler) [reviewing court independently determines whether juror
was biased].) Courts have stressed the particular need for independent review of the trial

                                             23.
court‟s reasons for denying a new trial motion in juror bias cases. This is because the
reviewing court must protect the complaining party‟s right to a fully impartial jury as an
“„“inseparable and inalienable part” of the [fundamental] right to jury trial [(U.S. Const.,
amend. VI; Cal. Const., art. I, § 16)]. [Citations.]‟” (People v. Ault (2004) 33 Cal.4th
1250, 1262.)
       D.      The Seminal Case of Carpenter
       In Carpenter, the defendant was found guilty of rape and murder, and was
sentenced to death. The trial court granted the defendant‟s habeas corpus petition based
on juror misconduct in obtaining extraneous information about the defendant‟s
convictions and death sentences in a related case. While the trial court stated that the
evidence of guilt was “„overwhelming,‟” it concluded that the usual harmless error test
did not apply. (Carpenter, supra, 9 Cal.4th at pp. 644-645.) The Supreme Court
reversed without prejudice to the defendant‟s right to file a new petition based on the
combined records of the habeas corpus proceeding and the underlying trial. (Id. at
p. 660.) In a four-to-three opinion, a divided Supreme Court set forth a two-part test for
determining bias in an extraneous source case.
       First, inherent bias is shown if the extraneous material, judged objectively, is
inherently and substantially likely to have influenced the juror—in other words, had an
“„“effect on the verdict or … deprived the complaining party of thorough consideration
of his case .…”‟” (Carpenter, supra, 9 Cal.4th at p. 652, quoting from Hasson v. Ford
Motor Co. (1982) 32 Cal.3d 388, 416 (Hasson)), or the vote of the juror was influenced
by exposure to prejudicial matter relating to the defendant (Carpenter, supra, at p. 651,
quoting from People v. Marshall (1990) 50 Cal.3d 907, 950-951 (Marshall)). This test is
“analogous to the general standard for harmless-error analysis under California law.”
(Carpenter, supra, at p. 653.) Under that standard, trial court error is deemed harmless
unless there is a reasonable probability that it affected the verdict. (People v. Watson
(1956) 46 Cal.2d 818, 836 (Watson).)

                                             24.
       Second, if the misconduct and surrounding circumstances make it substantially
likely that the juror was actually biased against the defendant, the judgment must be set
aside no matter how convinced the court might be that an unbiased jury would have
reached the same result. (Carpenter, supra, 9 Cal.4th at p. 654.)
       Respectfully, we find the Carpenter majority opinion confusing and in some
respects contradictory of the very case authority it relies on in reaching its conclusion that
harmless error analysis applies to a case of inherent juror bias. In applying the harmless
error analysis, Carpenter announces a rule that arguably undermines the integrity of our
jury system. (Nesler, supra, 16 Cal.4th at p. 578 [requirement that verdict must be based
on evidence developed at trial goes to fundamental integrity of trial by jury].) We are not
the first court to question the reasoning, language and conclusion of the Carpenter
opinion. (See People v. Von Villas (1995) 36 Cal.App.4th 1425, 1445-1458 (Woods, J.,
dis. opn.).) We will explain.
       After summarizing and approving prior case law concerning juror exposure to
extraneous information—including Marshall, supra, 50 Cal.3d at pages 950 through 951
and People v. Holloway (1990) 50 Cal.3d 1098 (Holloway), disapproved on another point
in People v. Stansbury (1995) 9 Cal.4th 824, 830, fn. 1—for the propositions that
(1) harmless error analysis for ordinary trial error does not apply to inherent juror bias
based on a juror‟s exposure to extraneous material, (2) consideration of actual prejudice
is not warranted in such circumstances, and (3) the ultimate question of whether a juror‟s
exposure to extraneous material constitutes reversible juror misconduct is judged by an
objective standard, namely, whether, based on an examination of the extraneous material,
the court concludes the material is inherently and substantially likely to have influenced
the juror (Carpenter, supra, 9 Cal.4th at p. 651, citing and quoting from Marshall), the
Carpenter majority then inexplicably concludes its analysis by stating—directly contrary
to Marshall and Holloway—that inherent juror bias based on extraneous material is
governed by the general standard for harmless error analysis. (Carpenter, supra, at

                                             25.
p. 653.) Not only does the majority opinion not disapprove Marshall and Holloway, it
cites both cases approvingly for the rule that standard harmless error analysis does not
apply in an inherent bias case. Then, in an apparent turnaround, the Carpenter majority
declares, citing Hasson, that the presumption of prejudice can be rebutted where there is
overwhelming proof in support of the verdict. (Carpenter, supra, at p. 654, citing
Hasson, supra, 32 Cal.3d at p. 417.) In other words, under harmless error analysis, the
misconduct can always be deemed harmless if the evidence of guilt is strong enough.
       We find this proposition deeply troubling on many levels: it fails to uphold the
venerable and constitutional right to an impartial jury; it fails to recognize the difference
between assessing prejudice from ordinary trial error and from jury misconduct that
impugns the guarantee of an impartial jury; it conflicts with several Supreme Court cases
that did not apply harmless error analysis in an inherent bias case; it validates trial
outcomes even when a juror has flagrantly disregarded the rules of evidence and
procedure that the parties and trial judge have endeavored scrupulously to follow
throughout a trial; it significantly impairs the presumption of prejudice, which the law
imposes for this kind of jury misconduct; it holds that the only adverse “influence” on a
juror that matters is one that changes a juror‟s vote; it unduly expands the role of the
reviewing court in derogation of the jury‟s role; and it treats inherent juror bias the same
as the erroneous introduction of evidence in determining whether the judgment should be
reversed. We discuss each of these points in turn.
       E.      Effects of Carpenter
               1.     Right to Impartial Jury
       The United States and California Constitutions guarantee the right to an impartial
jury. (U.S. Const., 6th Amend. [“the accused shall enjoy the right to a speedy and public
trial, by an impartial jury”; Cal. Const., art. I, § 16 [“Trial by jury is an inviolate right”];
People v. Wheeler (1978) 22 Cal.3d 258, 265 [art. I, § 16 includes the right to have
verdict rendered by impartial jurors], overruled in part by Johnson v. California (2005)

                                               26.
545 U.S. 162, 165-173.) The integrity of any trial depends upon the impartiality of the
judge and jury. A major objective of the jury selection process and the trial court‟s
repeated admonition that jurors not discuss the case with others and not consider matters
outside the evidence received in the courtroom is to select jurors who are and will remain
impartial. Any deficiency that undermines a trial‟s integrity calls for reversal without
consideration of actual prejudice. (Carpenter, supra, 9 Cal.4th at p. 651, quoting from
Marshall, supra, 50 Cal.3d at p. 951.)
              2.      Harmless Error Analysis
       Harmless error analysis presupposes an impartial judge and jury. (Rose v. Clark
(1986) 478 U.S. 570, 576-579.) Our California Constitution specifies that no judgment
may be set aside based on errors of misdirection of the jury, improper admission or
rejection of evidence, errors of pleading, or errors of procedure unless the error results in
a miscarriage of justice. (Cal. Const., art. VI, § 13.) Whether a miscarriage of justice
occurs depends on whether the error affected the outcome of the case. (People v.
Breverman (1998) 19 Cal.4th 142, 165.) When one of these enumerated trial errors is
established, the harmless error test permits a reviewing court to consider the weight and
strength of the evidence to determine if the lower court error was prejudicial, that is,
whether the error affected the outcome. (Watson, supra, 46 Cal.2d at p. 836.) Juror
misconduct is not one of the trial errors enumerated in article VI, section 13.
       Some lower court errors defy harmless error analysis, such as when a defendant is
deprived of his right to counsel or where the trial judge is not impartial. (Arizona v.
Fulminante (1991) 499 U.S. 279, 309-310.) The reason is this: “Each of these
constitutional deprivations is a similar structural defect affecting the framework within
which the trial proceeds, rather than simply an error in the trial process itself. „Without
these basic protections, a criminal trial cannot reliably serve its function as a vehicle for
determination of guilt or innocence, and no criminal punishment may be regarded as
fundamentally fair.‟ (Rose v. Clark, [supra], 478 U.S., at 577-578 (citation omitted).”

                                              27.
(Id. at p. 310.) Likewise, an inherently biased juror who has received extraneous
information prejudicial to the defense commits more than a simple error in the trial
process. The misconduct infects the legitimacy of the entire trial framework.
       We believe the Marshall and Holloway decisions got it right in declaring that
when it is inherently likely that extraneous information influenced a juror, an appellate
court‟s opinion of the strength of the evidence of guilt should not and may not be used to
uphold the verdict.20 If the extraneous information is sufficient to lead a reviewing court
to conclude the information is substantially likely to have influenced the juror, that
should end the inquiry. Inherent juror bias is still bias. The strength of the evidence can
never erase a verdict‟s taint of juror bias, whether actual or inherent.
       Our case is analogous to cases where the jury has been misinstructed on the
burden of proof. When a jury is instructed on a lower standard of proof than proof
beyond a reasonable doubt, the harmless error test does not apply:

              “[I]f a reviewing court were to rely on its view of the overwhelming
       weight of the prosecution‟s evidence to declare there was no reasonable
       possibility that the jury based its verdict on a standard of proof less than
       beyond a reasonable doubt, the court would be in the position of expressing
       its own idea „of what a reasonable jury would have done. And when [a
       court] does that, “the wrong entity judge[s] the defendant guilty.”
       [Citations.]‟” (People v. Aranda (2012) 55 Cal.4th 342, 368 (Aranda),
       quoting from Sullivan v. Louisiana (1993) 508 U.S. 275, 281 (Sullivan).)
       Here, it is likely that Juror No. 9‟s receipt of the extraneous information contained
in the prior appellate opinion prejudiced the defense, as we discuss below. It can never
be proven whether Juror No. 9‟s exposure to the prior appellate opinion actually affected

20      This is also in line with the American Bar Association standards (Marshall, supra,
50 Cal.3d at pp. 950-951) and consistent with two earlier Supreme Court opinions that
reversed convictions due to juror receipt of extraneous information, without giving any
consideration to the strength of the evidence of guilt (People v. Honeycutt (1977) 20
Cal.3d 150, 157-158; People v. Pierce (1979) 24 Cal.3d 199, 206-207 [Watson harmless
error test not appropriate]).



                                             28.
his vote on the verdict. (Evid. Code, § 1150 [effect of a statement or conduct on juror‟s
mental processes or voting is inadmissible].) But viewing the prior appellate opinion
objectively, we conclude there is a substantial likelihood that the material influenced
Juror No. 9 in a way that favored the prosecution and disfavored the defense. For
example, the extraneous information may have, in Juror No. 9‟s mind, lowered the
prosecution‟s burden, shifted the burden of proof to the defense, or made him skeptical of
defense theories or evidence. (People v. Martinez (1978) 82 Cal.App.3d 1, 21-22; People
v. Cumpian (1991) 1 Cal.App.4th 307, 312 [prosecutor‟s burden lightened or defense
contradicted].) This is so even though Juror No. 9 may still have voted for guilt had he
not received the extraneous information (as speculative as that is).
       The People, relying on Carpenter, contend that regardless of the quantity or
prejudicial content of the extraneous information, and as long as it does not amount to
actual bias, inherent juror bias should be deemed harmless if the appellate court
determines the evidence of guilt is sufficiently compelling. But a defendant‟s right to an
impartial jury is trivialized if a reviewing court can excuse serious jury misconduct by
declaring that any reasonable juror who had not been exposed to the extraneous
information would have found the defendant guilty anyway.
              3.     Conflicts with Precedent
       In 1990, just five years before Carpenter was handed down, the California
Supreme Court decided Marshall and Holloway. Both opinions made the emphatic point
that assessing prejudice resulting from a juror‟s exposure to extraneous information is
“different from” and “less tolerant than” harmless error analysis for ordinary trial error.
(Marshall, supra, 50 Cal.3d at p. 951; Holloway, supra, 50 Cal.3d at p. 1110.)
Marshall‟s opinion was unanimous and Holloway included a single, concurring opinion
and no dissent. Carpenter cites both cases approvingly and even quotes the above
language in its own opinion. (Carpenter, supra, 9 Cal.4th at p. 651.)



                                             29.
       Marshall did not announce a new rule. Earlier Supreme Court decisions reversed
convictions based on a juror‟s obtaining extraneous information without any discussion
of the strength of the evidence or the harmless error rule. (See People v. Von Villas,
supra, 36 Cal.App.4th at pp. 1446-1447 (Woods, J., dis. opn.).) And, lest there be a
concern that the presumption of prejudice is too difficult to overcome in the absence of
the harmless error rule, we point out that our Supreme Court has affirmed several cases
since Carpenter, supra, 9 Cal.4th 634 by finding that the information was not prejudicial
to the defendant for reasons unrelated to the strength of the evidence of guilt. (People v.
Thomas (2012) 53 Cal.4th 771, 819 [juror learning of witness‟s wife‟s recent shooting
death not likely prejudicial because witness‟s testimony only involved defendant‟s
purchase of a truck, which was not actively contested]; People v. Tafoya (2007) 42
Cal.4th 147, 195 [no likelihood of detrimental influence because the misconduct occurred
after the verdict]; People v. Yeoman (2003) 31 Cal.4th 93, 159-160 [juror‟s improper
remarks about drug screening procedures at jail not objectively prejudicial because
whether the defendant was under the influence had little relevance to his mental state and
whether he ever used drugs was not at issue]; People v. Jenkins (2000) 22 Cal.4th 900,
1048 [prejudice rebutted where juror who received information about case from news
source was questioned during trial and trial judge made findings that juror learned very
little, asserted he could be fair, was conscientious juror, and was relieved to learn that
news account was false].)
       The Marshall test for evaluating prejudice in an inherent bias case is reasonable.
If the reviewing court, after a careful review of the record, determines it is inherently and
substantially likely that the extraneous material influenced the juror to the defendant‟s
detriment, the judgment must be set aside. Prejudice in this context does not require
proof of “actual prejudice,” that is, proof that the extraneous material changed a juror‟s
vote. Thus, this prejudicial analysis is different from and less tolerant than harmless error
analysis. (Marshall, supra, 50 Cal.3d at p. 951; Holloway, supra, 50 Cal.3d at p. 1110;

                                             30.
Carpenter, supra, 9 Cal.4th at p. 651.) We would clarify the test by making explicit that
influencing a juror to the defendant‟s detriment means likely to cause a juror to lower the
prosecutor‟s burden, shift the burden to the defense, become skeptical of defense
evidence or theories, deprive the defendant of thorough consideration of his case, or vote
differently than the juror would have if not exposed to the extraneous information.
              4.      Disregard of Rules of Evidence and Procedure
       The Carpenter rule can lead to affirming verdicts in cases where the rules of
evidence and procedure, which trial judges and counsel endeavor scrupulously to follow,
are flagrantly disregarded by a juror or jurors. (Holloway, supra, 50 Cal.3d at p. 1110
[court‟s and counsel‟s “efforts were to no avail”].)
       A jury trial is not a free-for-all presentation of evidence and argument. Guided by
the rules of evidence, along with considerations of procedural and substantive law, a trial
judge makes numerous rulings that regulate the admissibility of evidence. These rulings
directly influence the parties‟ trial strategies, including what witnesses to call, what
questions to ask and how to argue their cases before the jury. Counsel are bound by the
trial court‟s rulings and are often expressly prohibited from bringing certain matters
before the jury by way of evidence or argument. When jurors receive information about
the case outside of the courtroom, all of the work of the court and parties to comply with
the law is potentially undone. When the extraneous information is viewed objectively
and the court determines the information is likely to have biased the juror against the
defendant, it is not reasonable, in light of the trial court‟s efforts to limit the evidence to
what is permitted by law, to uphold the verdict simply because a reviewing court thinks
the defendant would have been convicted anyway.
       By way of illustration, assume a defendant is charged with robbery and there is
overwhelming evidence of his guilt. Assume six jurors independently learn from reading
the newspaper the following additional information that was expressly ruled inadmissible
before the trial began: the defendant had four prior robbery convictions, had been to

                                               31.
prison, was on parole when the instant offense occurred, confessed to the crime (a
Miranda violation made it inadmissible), and had two other pending robbery cases. The
six jurors do not share this information with any other jurors. No actual bias is shown.
Can this serious misconduct be regarded as harmless and the verdict upheld simply
because the reviewing court concludes that the defendant, in the absence of the jury
misconduct, would have been convicted anyway? According to Carpenter, the answer is
yes.
              5.     Presumption of Prejudice
       Carpenter renders the presumption of prejudice useless when the evidence of guilt
is “„overwhelming.‟” (Carpenter, supra, 9 Cal.4th at p. 655.) A verdict should not stand
if an objective view of the extraneous information leads to the conclusion that the
extraneous information was substantially likely to have influenced the juror. (Marshall,
supra, 50 Cal.3d at pp. 650-651.) Extraneous material can influence a juror in different
ways: lowering the prosecutor‟s burden, shifting the burden to the defense, making the
juror skeptical of defense evidence or theories, depriving the complaining party of
thorough consideration of his case, or actually causing the juror to vote differently than
the juror would have if he or she had not received the outside material. Since a defendant
cannot elicit from a juror how the information affected the juror‟s thinking (Evid. Code,
§ 1150), the law imposes a presumption of prejudice to compensate for this evidentiary
handicap. (Carpenter, supra, 9 Cal.4th at p. 652.) But allowing the weight of the
evidence—as judged by a reviewing court—to overcome the presumption renders the
presumption illusory. It is circular reasoning to impose the presumption because of a
defendant‟s legal inability to prove actual prejudice, and then allow the prosecution to
overcome the presumption by convincing the court that the defendant would have been
convicted in the absence of the misconduct, when it is clear that the defendant cannot
offer any rebuttal because he is precluded from asking jurors about the effect the outside
material had on their thought processes.

                                            32.
       In other words, if the evidence is strong enough, there really is no presumption of
prejudice, which means the only way a defendant will be entitled to a new trial based on
jury misconduct in receiving extraneous information is to prove actual prejudice, which
Evidence Code section 1150 precludes him from proving.
              6.     Influencing a Juror
       Although Carpenter does not say so expressly, one effect of applying the harmless
error analysis in these circumstances is to declare categorically that the only influence on
a juror that is relevant is whether the extraneous material actually affected the juror‟s
vote. Carpenter ignores other inimical influences that may occur, such as lowering the
prosecutor‟s burden, shifting the burden to the defense, or making the juror skeptical or
distrustful of defense evidence or theories. It also ignores language in its own opinion
that the presumption of prejudice is an “„“aid to those parties who are able to establish
serious misconduct of a type likely to have had an effect on the verdict or which deprived
the complaining party of thorough consideration of his case .…”‟” (Carpenter, supra, 9
Cal.4th at p. 652, quoting from Hasson, supra, 32 Cal.3d at p. 416, italics added.) No
one could reasonably argue that such influences are innocuous or do not matter. They
can affect a juror‟s ability to cast his or her vote based solely on the evidence received in
court and affect a juror‟s ability to hold the prosecution to the burden of proving guilt
beyond a reasonable doubt.
       Thus, prejudice can be shown not only when the misconduct results in a different
verdict, but also when the misconduct deprives the defendant of thorough consideration
of his case. If an objective appraisal of the extraneous information leads a reviewing
court to conclude that it is likely such information would lower the prosecution‟s burden,
shift the burden to the defense, or create skepticism about the defense in the mind of a
juror receiving such information, then the defendant has been prejudiced because he has
been deprived of thorough consideration of his case by an unbiased jury.



                                             33.
       We know that if a trial court errs in instructing on the prosecution‟s burden of
proof, the error is reversible per se; harmless error analysis does not apply. (Aranda,
supra, 55 Cal.4th at p. 367; Sullivan, supra, 508 U.S. at p. 281.) We fail to discern a
difference between a case where the trial court has misinstructed on the prosecution‟s
burden of proof and a case of jury misconduct based on receipt of extraneous information
that influenced the juror by lowering the prosecutor‟s burden of proof or shifting it to the
defense. If the reviewing court believes the material was substantially likely to have
influenced the juror in one of these ways, there should be no further opportunity to rescue
the verdict under the harmless error test. This is particularly so when the misconduct is
discovered after the verdict because there is no opportunity for the court to take
corrective steps through admonition or other measures. (Holloway, supra, 50 Cal.3d at
pp. 1111-1112.) The inherent bias test, as described in Marshall and Holloway, is
reasonable, understandable and sufficient to identify reversible prejudice. The harmless
error test should not be tacked on to it.
              7.      Expanding Reviewing Court’s Role
       Another concern is that Carpenter expands an appellate court‟s traditional limited
role to one that includes weighing evidence to determine whether a jury would have
convicted defendant absent the misconduct. While appellate courts are called upon to
consider the weight of the evidence in applying harmless error analysis to ordinary trial
error scenarios (Watson, supra, 46 Cal.2d 818) and to cases in which federal
constitutional error has occurred (Chapman v. California (1967) 386 U.S. 18), such is not
the case where the error is “structural” (Arizona v. Fulminante, supra, 499 U.S. at p. 309)
or undermines the integrity of a trial (Marshall, supra, 50 Cal.3d at p. 951). A conviction
marred by juror bias—actual or inherent—undermines the integrity of a trial. When a
reviewing court nonetheless affirms a conviction by applying the harmless error test, then
“„“the wrong entity judge[s] the defendant guilty”‟” (Aranda, supra, 55 Cal.4th at p. 368,



                                            34.
quoting from Sullivan, supra, 508 U.S. at p. 281), and it oversteps its role as a reviewing
court and treads on the exclusive domain of the jury.

               8.       Treating Inherent Juror Bias the Same as Erroneous
                        Introduction of Evidence at Trial
       Carpenter declares that “a finding of „inherently‟ likely bias is required when, but
only when, the extraneous information was so prejudicial in context that its erroneous
introduction in the trial itself would have warranted reversal of the judgment.”
(Carpenter, supra, 9 Cal.4th at p. 653.) However, these two situations (inherent juror
bias and erroneous introduction of evidence) should not be treated the same.
       It is a common, everyday trial experience to have prejudicial evidence (or
argument) introduced in open court after which the trial judge is asked to strike the matter
and instruct the jury to disregard it. There is a standard jury instruction that reminds
jurors not to consider matters that the court previously told them to disregard.
(CALCRIM No. 104; CACI No. 106.) In most situations, any prejudicial effect is
eliminated or at least mitigated by the court‟s instruction, since jurors are presumed to
follow the court‟s instructions. (People v. Boyette (2002) 29 Cal.4th 381, 436.) Even if
no corrective instruction is given, the attorneys have the opportunity to respond to such
evidence with cross-examination, rebuttal witnesses and closing argument. Not so with
inherent juror bias that is discovered after the verdict.
       Another difference is that jury misconduct based on receipt of extraneous material
carries with it a presumption of prejudice, while the erroneous introduction of evidence in
the trial itself does not.
       Finally, and most importantly, if inherent juror bias exists, then the parties have
lost their constitutional right to have their case decided by an impartial jury. On the other
hand, the introduction of erroneous evidence normally does not jeopardize a fundamental,
constitutional right.




                                              35.
       F.     Confusing References in Carpenter
       The Carpenter majority confusingly cites Marshall for the proposition that in an
actual bias case, harmless error analysis does not apply. (Carpenter, supra, 9 Cal.4th at
p. 654, citing and quoting from Marshall, supra, 50 Cal.3d at p. 951.) We agree that the
harmless error test does not apply in an actual bias case, but Marshall was not an actual
bias case and never addressed the subject of actual bias. It dealt with inherent juror bias.
Thus, the portion of the Marshall opinion that Carpenter cites in support of its
declaration that harmless error analysis does not apply to actual juror bias was actually a
statement the Marshall court made regarding inherent juror bias.
       The Carpenter majority cites Hasson as an example of the application of the
harmless error analysis in an extraneous information case (Carpenter, supra, 9 Cal.4th at
p. 654). But the portion of the Hasson opinion cited by Carpenter dealt with misconduct
based on juror inattentiveness, not on a juror‟s receipt of extraneous information.
(Hasson, supra, 32 Cal.3d at p. 414.) The Carpenter majority‟s characterization of
Hasson as an example of a case in which the harmless error standard was applied in an
extraneous information case is simply incorrect.
       G.     Reconsideration of Carpenter
       We respectfully urge our Supreme Court to reconsider its Carpenter opinion and
to follow the Marshall-Holloway line of authority that excludes application of the
harmless error analysis in an inherent juror bias case based on receipt of extraneous
information. We believe that harmless error analysis should not apply to cases of juror
bias, whether actual bias or inherent bias. The test of whether a juror was influenced by
the extraneous information should not be limited to the situation where it caused the juror
to cast a different vote than the juror would have cast if the extraneous material had not
been considered. It should be sufficient to show juror bias if the extraneous material is
substantially likely to have caused the juror to lower the prosecutor‟s burden, shift the



                                             36.
burden to the defense, become skeptical of defense evidence or theories, or deprive the
defendant of thorough consideration of his case.
       H.     Analysis of the Present Case
              1.      No Actual Bias
       Here, the trial judge determined that there was no actual bias on the part of Juror
No. 9. We agree that the record does not support any finding of actual bias. Although
his misconduct was flagrant, Juror No. 9 did not discuss what he did or what he learned
with the other jurors and there is no indication that he prejudged the case. (Carpenter,
supra, 9 Cal.4th at p. 657 [“a biased juror would likely have told other jurors what she
had learned”].) The trial court did not abuse its discretion when it ruled that Juror No. 9
had no actual bias.
              2.      Inherent Bias and Prejudice
       The trial judge found, and both sides agree, that Juror No. 9‟s misconduct
constituted inherent bias, which creates a presumption of prejudice that is rebuttable by
the People or by the court‟s review of the entire record. We have considered the People‟s
arguments and authorities and we have reviewed the record. In our view, the
presumption of prejudice has not been overcome. We reach this conclusion under both
the Marshall-Holloway test (objective standard applies to determine whether extraneous
material is inherently and substantially likely to have influenced the juror without
consideration of harmless error analysis or actual prejudice) and the Carpenter test
(harmless error test does apply). We conclude that the extraneous information was so
prejudicial in context that its erroneous introduction in the trial itself would have
warranted reversal of the judgment. (Carpenter, supra, 9 Cal.4th at p. 653.)
       The People, however, assert that the presumption of prejudice has been overcome
“since most of the additional information [J]uror [No.] 9 learned from this Court‟s prior
appellate opinion—„a time line of the case, facts … and details about DNA‟—was



                                             37.
presented to the jury anyway” and because the evidence was “truly overwhelming.” We
address and reject both contentions.
              3.     The People’s Contentions Lack Merit

                     a.      The Extraneous Information Was Not Introduced in the
                             Second Trial
       First, the People contend that the juror misconduct does not require reversal
because most of the extraneous information “was presented to the jury anyway.” In order
to assess this assertion we will now juxtapose the contents of the prior appellate opinion
with the evidence received in the second trial to determine whether inherent prejudice
should be presumed or whether the People are correct that most of the extraneous
information “was presented to the jury anyway.”21
       The second jury was not directly informed that there had been a first trial, that
defendant had previously been convicted of the crimes for which he was then on trial, or
that he had been sentenced to life in prison.22 The prior appellate opinion begins by
stating that defendant was previously convicted of murder, forcible lewd or lascivious
conduct on a child under age 14, and forcible rape. This information was potentially
prejudicial to the defense because Juror No. 9 became aware that 12 other jurors had
concluded unanimously and beyond a reasonable doubt that defendant committed these
crimes. Moreover, the court and parties endeavored not to mention these matters to the
second jury. This has some similarity to Holloway, where the court reversed a conviction
based on a juror‟s misconduct in reading a newspaper account that revealed the defendant

21      The trial judge commented, “And certainly, you know, [Juror No. 9 was] privy to
a lot of information that he should not have been privy to.”
22       For the most part, the attorneys and witnesses avoided mentioning that there had
been an earlier trial. Instead, when necessary to refer to testimony given in the first trial,
they characterized the first trial as a “previous proceeding,” “prior proceeding,” “earlier
proceedings,” and the like, although one witness referred to “the original trial” and the
“first trial.”


                                              38.
was on parole for another assault when he was arrested for the charged crimes. The court
explained:

               “The entire case was tried on the premise that defendant‟s prior
        record was inadmissible. There was no voir dire about it, no limiting
        instructions were given, and the parties went to great effort to excise such
        references from defendant‟s extrajudicial statements. The court had no
        chance to take any curative measures because of Juror Beck‟s concealment
        of the misconduct. In such circumstances, we are unable to say that the
        juror misconduct did not prejudicially affect the outcome of the trial.”
        (Holloway, supra, 50 Cal.3d at p. 1112.)
However, Juror No. 9‟s knowledge of defendant‟s convictions, standing alone, may not
have been sufficiently prejudicial to warrant reversal. (People v. Ledesma (2006) 39
Cal.4th 641, 683 (Ledesma) [nothing incurably prejudicial about a jury learning that a
defendant was previously convicted of the crime for which he was then on trial];
Carpenter, supra, 9 Cal.4th at p. 655 [evidence that the defendant had been convicted of
different but related crimes not prejudicial where evidence was overwhelming and the
only fact the juror learned out of court was the verdict of the first jury].) But there is
more.
        The prior appellate opinion quotes from the statement of facts contained in the
earlier opinion (Pizarro I, supra, 10 Cal.App.4th 57). The statement of facts from
Pizarro I mentions that defendant testified in the first trial. He did not testify in the
second trial, and the second jury was never informed that there had been an earlier trial or
that defendant had testified in a previous trial. Surely, the defense did not want the
second jury to know that defendant had previously been convicted or that he had testified
in the first trial. While the jury was properly instructed that defendant had a
constitutional right not to testify and that the jury was not to discuss this subject or
penalize defendant for exercising that right, it is reasonable to project that, armed with the
knowledge that defendant had been convicted in an earlier trial in which he testified, a
juror would be inclined to think defendant chose not to testify in his second trial because


                                              39.
the defense believed that his testimony in the first trial contributed to his earlier
conviction. If this occurred in the mind of Juror No. 9, it certainly prejudiced defendant,
but Evidence Code section 1150 precludes inquiry into Juror No. 9‟s mental processes.
Prejudice is presumed from the misconduct. Again, by itself, the disclosure that
defendant testified in the first trial may not be enough to establish prejudice warranting
reversal. (Ledesma, supra, 39 Cal.4th at p. 683.) But there is more.
       On the subject of defendant‟s sobriety on the day of the crime, the prior appellate
opinion states defendant had consumed beer throughout the afternoon and continued to
drink at the party. When Sandy asked him to get into their truck, he behaved erratically,
crisscrossing the road, lying in front of the truck and hiding from her. Later, he showed
up at his mother‟s house and, according to his mother, appeared to be drunk. The People
counter by citing testimony received in the second trial in which some witnesses said
defendant did not appear intoxicated or he seemed to be handling his alcohol “okay.”
The People miss the point. The question here is whether Juror No. 9 was substantially
likely to have been prejudiced against defendant on the subject of his sobriety based on
the prior appellate opinion‟s statement of the facts. That statement of facts leaves no
doubt that the appellate court‟s review of the trial record led it to conclude that defendant
was drunk. If the second trial evidence was in conflict on the issue, Juror No. 9 had the
impression that a panel of appellate justices had concluded he was drunk. Thus, the
People‟s claim that the extraneous information was presented to the jury anyway is not
accurate. The jury was not told that an appellate court‟s review of the evidence led it to
conclude that defendant was drunk. This information, judged objectively, was inherently
and substantially likely to have influenced Juror No. 9 unless intoxication had nothing to
do with the crimes, which leads us to the next related issue: motive.
       The prior appellate opinion reveals that defendant told an investigator that alcohol
made him violent. This testimony was never mentioned in the second trial. Not only
does this admission make relevant how much alcohol defendant had consumed at the

                                              40.
time of the crime, it also furnishes an explanation for why this homicide even occurred.
Defendant points out that the People offered no explanation for why he would harm his
younger half-sister except for his intoxication and desire for sexual gratification, and that
there was no evidence of any prior improper behaviors between them and no evidence
that defendant had ever been violent. Therefore, defendant‟s admission that alcohol
made him violent, coupled with the appellate court‟s conclusion that he was drunk at the
time, supplies the necessary motivation or explanation for why defendant would commit
such an abominable crime against his 13-year-old half-sister.
       The People point out that the defense attempted to use alcohol as a defense to
minimize defendant‟s mental state. If so, defendant‟s admission in the first trial that
alcohol made him violent becomes particularly prejudicial because the more the defense
emphasized his intoxication as a mitigating factor, the more inculpatory his admission
became. In other words, the admission that alcohol made him violent ran directly
contrary to the defense position that his intoxication mitigated his culpability. Instead of
minimizing his culpability, the admission explained his culpability. The prior appellate
opinion‟s inclusion of this admission was potentially devastating to the defense in the
mind of any juror who read it. Judged objectively, this admission was inherently and
substantially likely to have influenced Juror No. 9. (Carpenter, supra, 9 Cal.4th at
p. 653.) There is more.
       Most of the prior appellate opinion is devoted to a discussion of the DNA evidence
in very technical and scientific terms. Aside from the complexities of that discussion, the
opinion makes clear that the FBI conducted its own analysis of the DNA and concluded
that the DNA from the sperm on the vaginal swabs matched the known blood sample of
defendant. This court‟s opinion reversed the conviction because of flaws in the DNA
testing procedures. The second trial made no mention of the FBI‟s DNA analysis or its
conclusions. A reading of the prior appellate opinion‟s introduction or statement of the
facts would inform the reader that the FBI‟s DNA analysis led it to conclude that

                                             41.
defendant was Amber‟s assailant and killer. This was the same conclusion reached by
the California DOJ, which years later conducted its own DNA analysis that was presented
in the second trial. The prior appellate opinion‟s disclosure of the FBI‟s analysis and
conclusion corroborated the conclusion of the DOJ and thereby created a substantial
likelihood of juror bias. It likely lightened the prosecution‟s burden on convincing Juror
No. 9 of the soundness of the DOJ‟s conclusions because a separate and nationally
recognized crime lab analyzed the DNA and came to the same conclusion. This is
analogous to an appellate court‟s reversing a conviction because an eyewitness‟s
testimony should have been excluded and then having a juror in the second trial learn,
through an extraneous and improper source, that there was an eyewitness who saw
defendant commit the crime, but for technical legal reasons was not allowed to testify at
the second trial. Judged objectively, the FBI‟s conclusion was inherently and
substantially likely to have influenced Juror No. 9. (Carpenter, supra, 9 Cal.4th at
p. 653.) There is still more.
       The prior appellate opinion also declares that the evidence presented a “„strong
circumstantial case‟” against defendant. (Pizarro II, supra, 110 Cal.App.4th at p. 634.)
Thus, Juror No. 9 sat through the balance of the trial with the knowledge that an appellate
court believed the case against defendant was a strong one. Imagine if, on the second or
third day of trial, a juror overheard a trial judge comment to someone off the record that
the case against the defendant was a “„strong circumstantial case‟” (ibid.); or, even worse,
if the trial judge made such a comment on the record in open court in front of the jury.
Would not the defense have legitimate grounds to object and move for mistrial because of
the understandable concern that the judge‟s comments would tend to influence the jury
and thereby prejudice the defense? Would not such a comment, judged objectively,
create a substantial likelihood that the jury would give some deference to the judge‟s
implied opinion that the defendant was guilty or at least that the prosecution had met their
burden of proof? Here, instead of the trial judge making such a comment, we have a

                                            42.
three-judge appellate panel doing so in a formal appellate opinion. Judged objectively,
this statement was inherently and substantially likely to have influenced Juror No. 9.
(Carpenter, supra, 9 Cal.4th at p. 653.)
       These enumerated items of information, which were disclosed in the prior
appellate opinion read by Juror No. 9, were not presented “to the [second] jury anyway,”
as asserted by the People. Indeed, the trial court and counsel made special efforts to
ensure that several of these matters were never revealed to the second jury. Juror No. 9‟s
misconduct spoiled those efforts.
                     b.      The Evidence of Guilt Was Not “Overwhelming”
       Second, the People contend that the evidence of defendant‟s guilt was “truly
overwhelming” and therefore any juror misconduct was harmless. They cite Carpenter
for the proposition that where the evidence is “„overwhelming,‟” the extraneous
information cannot be considered inherently prejudicial. (Carpenter, supra, 9 Cal.4th at
p. 655.)23 In Carpenter, the trial judge specifically found the evidence of guilt
“„overwhelming,‟” but erroneously concluded that the extraneous information was
inherently prejudicial without considering the entire record. (Ibid.) The judge also stated
that the usual harmless error tests did not apply. (Id. at p. 644.) By contrast, in the
instant case, the trial judge did not state the evidence of guilt was overwhelming. The
Carpenter case was cited by the parties and mentioned numerous times during oral
argument on the new trial motion and yet the trial judge never characterized the evidence
as “„overwhelming‟” as a basis for denying the new trial motion. Instead, the trial judge


23      Although the rule of Carpenter is that overwhelming evidence of guilt can rebut
the presumption of prejudice in an inherent bias case, the opinion offers no definition or
description of what constitutes overwhelming evidence of guilt. The opinion does not
detail or summarize the prosecution‟s evidence, but merely quotes from the trial judge
who found the evidence of guilt overwhelming. No guidance is offered as to how or
when a “strong” prosecution case converts to one that is “overwhelming.”



                                             43.
stated that the decision he had to make on the motion for new trial was “a close case” and
“very, very hard.” Presumably, if the trial judge believed the evidence was
overwhelming, he would have said so.24
       The People point to the DNA evidence (derived from sperm) as indicative that the
evidence weighed strongly in favor of defendant‟s guilt. Such evidence, however, only
established that defendant had sex with Amber within 72 hours of the homicide. It did
not prove whether that sexual activity was consensual or accomplished by force. Indeed,
the second jury acquitted defendant of the forcible rape charge. The DNA evidence did
not establish that defendant had sex with Amber at or near the time she was killed or that
he was with her at the time she was killed. The DNA evidence proved the statutory rape
charge, but no more.
       While there was considerable circumstantial evidence that defendant committed
the homicide, there were other evidentiary considerations that raised doubts about his
guilt. For example, there were no eyewitnesses. There was no confession by defendant.
The only blood found at the scene belonged to Amber. Not only was there no evidence
that defendant had ever harmed his half-sister in the past or had a motive to do so, the
uncontroverted evidence from their mother was that the two of them were “extra close”
and defendant was “devastated” when he learned Amber was dead. There was evidence
that Scott Nelson confessed to the crime.
       It took 10 days to present the evidence in this trial. The jury deliberated over the
course of six days. During those six days, the jury requested further instruction on the

24     We also note that the jury reported they were deadlocked (the record does not
reveal how they were split in their voting) after several days of deliberation, which may
suggest that the evidence was not overwhelming. After reporting they were deadlocked,
Juror No. 7 was discharged for juror misconduct and replaced. Deliberations began anew
and a verdict was later returned, but only after the newly constituted jury reported a
deadlock on counts 2 and 3. Two reports of jury deadlock tend to refute the claim that
the evidence of guilt was overwhelming.



                                            44.
felony murder rule and additional attorney argument on numerous topics. The jury twice
reported being deadlocked.25 These facts are not consistent with a case of overwhelming
evidence of guilt.
                     c.      Carpenter, Ledesma, Malone Do Not Require Affirmance
       Our decision does not run afoul of the authorities cited by the People. The People
rely primarily on Carpenter, supra, 9 Cal.4th 634, Ledesma, supra, 39 Cal.4th 641, and
In re Malone (1996) 12 Cal.4th 935 (Malone) in support of the argument that
Juror No. 9‟s misconduct in reading the prior appellate opinion does not require reversal.
The qualitative and quantitative content of the extraneous material contained in the prior
appellate opinion read by Juror No. 9 distinguishes this case from the cases cited by the
People.
       In Carpenter, the high court reversed the trial judge‟s order granting a new trial. It
upheld a capital conviction even though a juror received information that the defendant
had been convicted of different but related capital crimes. The underlying facts of those
related crimes were introduced in the trial, but jurors were not told the defendant had
been convicted of those crimes. The Supreme Court held there was no inherent bias in
light of the entire record, since the evidence was “„overwhelming‟” (quoting the trial
judge) and since the only fact the juror “learned out of court was the verdict of the first
jury.” (Carpenter, supra, 9 Cal.4th. at p. 655, fn. omitted.)
       This was not the case here. In addition to revealing that a prior jury had found
defendant guilty of the same crime for which defendant was on trial, even a cursory
reading of the prior appellate opinion uncovered several pieces of extraneous information
that were harmful and perhaps devastating to the defense (DNA analysis performed by
the FBI connected defendant to the crime, the appellate court described defendant‟s
alcohol consumption that day and characterized the evidence against defendant as a
25     See footnote 24, ante.



                                             45.
strong circumstantial case, defendant testified in the first trial, defendant told police that
alcohol made him violent). The Carpenter holding would be more analogous if
Juror No. 9‟s outside research resulted in his learning that defendant had been previously
convicted and nothing more. (See Ledesma, supra, 39 Cal.4th at p. 683 [“we do not
presume that knowledge that a defendant previously has been convicted and is being
retried is incurably prejudicial”].) Here there is so much more.
       Ledesma is similar to Carpenter. In Ledesma, after the defendant‟s first
conviction was reversed, his second jury learned that he previously had been convicted
and sentenced to death in the same case when a witness mentioned he had been on death
row. (Ledesma, supra, 39 Cal.4th at pp. 681-682.) Like Carpenter, the Ledesma court
concluded that there was nothing incurably prejudicial about a jury learning that a
defendant was previously convicted of the crime for which he was then on trial.
(Ledesma, supra, at pp. 682-684.) Again, our case involves considerably more
extraneous information than what was wrongfully disclosed in either Carpenter or
Ledesma.
       Malone is also cited by the People, but its facts bear no resemblance to ours. In
Malone, during jury deliberations, the foreperson expressed opinions about the
defendant‟s polygraph evidence based on her own professional study. (Malone, supra,
12 Cal.4th at pp. 944, 963.) While this constituted misconduct, the court found the
presumption of prejudice rebutted because the foreperson‟s comments were substantially
the same as the evidence and argument presented to the jury. Since the extraneously
derived information did not add to or detract from the actual evidence presented, the
court found that no prejudice occurred. (Id. at pp. 964-965.) In our case, the prior




                                              46.
appellate opinion did just the opposite—it supplied information that was never presented
to the jury because it was deemed prejudicial against defendant.26
              4.     Holloway
       Holloway supports our conclusion. In Holloway, the Supreme Court reversed a
death conviction. The trial judge denied mistrial and new trial motions based on
discovery of jury misconduct after the jury returned guilty verdicts of first degree murder
with special circumstances. During the trial, a juror had improperly read a newspaper
account which disclosed that, at the time of the charged offenses, the defendant had been
on parole for assaulting a woman with a hammer. The trial court had previously ruled
that the defendant‟s parole status and prior offense were inadmissible. (Holloway, supra,
50 Cal.3d at pp. 1106-1108.) The high court reversed the conviction, finding that the
presumption of prejudice had not been rebutted. That single disclosure was enough for
the court to find reversible prejudice. (Id. at pp. 1110-1111.) Here, there were multiple
pieces of highly prejudicial information that Juror No. 9 obtained. Even if no single item
was sufficiently prejudicial to warrant reversal, the combination of several items was.
              5.     Conclusion
       We conclude that the presumption of prejudice arising from Juror No. 9‟s
misconduct was not rebutted. Accordingly, the trial court abused its discretion in
denying defendant‟s motion for new trial. (People v. Staten (2000) 24 Cal.4th 434, 466;
People v. Perez (1992) 4 Cal.App.4th 893, 906.) Although our resolution of this issue




26     While we agree that a trial court‟s in limine ruling that evidence is inadmissible
under Evidence Code section 352 (more prejudicial than probative) is different from
deciding whether a jury‟s acquisition of that same information was prejudicial in light of
the entire record (Holloway, supra, 50 Cal.3d at p. 1112; see also Carpenter, supra, 9
Cal.4th at p. 655, fn. 2), it does not follow that such rulings are irrelevant on the subject
of prejudice.



                                             47.
dictates our reversal, we turn to issues regarding the DNA evidence that might be
relevant in case of a retrial.
II.    DNA EVIDENCE
       A.      Introduction
       When a perpetrator leaves his DNA behind after committing a crime—in this case,
in the form of sperm—his genetic profile can be created from that DNA. When a suspect
is identified, his genetic profile is analyzed and compared to the perpetrator‟s profile. If
the suspect‟s profile matches the perpetrator‟s profile, the suspect becomes a possible
perpetrator and the case against him may proceed. If the suspect‟s profile does not match
the perpetrator‟s profile, the suspect is exonerated and the case against him is over.
(Pizarro II, supra, 110 Cal.App.4th at pp. 541-542, 563; People v. Johnson (2006) 139
Cal.App.4th 1135, 1147.)
       In Pizarro II, we likened a genetic profile to a physical profile, where the suspect
is found to share a number of the perpetrator‟s physical traits (rather than genetic loci)—
such as hair color, eye color, and height—reported by an eyewitness. The match between
their traits directly incriminates the suspect (who is now the defendant) by demonstrating
that he resembles the perpetrator and therefore could be the perpetrator.27 But the match
alone does not establish the weight of the evidence. Anyone with the same profile could
be the perpetrator, and if a large number of people share the profile, the match does not
carry much evidentiary weight. Thus, the match requires a second piece of evidence—
the statistical frequency of the profile. “The statistical evidence gives the match evidence

27     As we noted in Pizarro II, a match between the perpetrator‟s and the defendant‟s
profiles “does not signify an absolute match between the entirety of the perpetrator‟s
DNA and the entirety of the defendant‟s DNA, which would absolutely prove the
perpetrator and the defendant are the same person. The match is actually between only a
few or several regions of an enormous amount of DNA, and therefore it does not
absolutely prove identity. What it does prove is that the defendant could be the
perpetrator.” (Pizarro II, supra, 110 Cal.App.4th at p. 576.)



                                             48.
its weight. It is an expression of the rarity of the perpetrator‟s profile, the size of the pool
of possible perpetrators, and the likelihood of a random match with the perpetrator‟s
profile.” (Pizarro II, supra, 110 Cal.App.4th at p. 542; see also id. at p. 576.) “The
determination of what is often called the „significance of the match‟ is a statistical
assessment of how incriminating it is that the defendant‟s profile matches the
perpetrator‟s.” (Id. at p. 576.) The rarer the profile in the population, the more likely the
defendant is in fact the perpetrator.28 (Id. at pp. 542, 576; see also People v. Johnson,
supra, 139 Cal.App.4th at p. 1147; People v. Venegas (1998) 18 Cal.4th 47, 82
(Venegas); National Research Council, The Evaluation of Forensic DNA Evidence
(1996) p. 127 (NRCII); National Research Council, DNA Technology in Forensic
Science (1992) p. 44 (NRCI).)
       We turn to a brief summary of the science behind STR analysis, which takes
advantage of the genetic phenomenon of STR‟s and is made possible by the molecular
biology process called the Polymerase Chain Reaction (PCR).
       DNA‟s double helix is often compared to a twisted ladder. The side rails of the
ladder are composed of a uniform sugar-phosphate backbone. The rungs of the ladder are
made of the bases adenine, guanine, cytosine, and thymine (A,G,C, and T). The linear
sequence of these four bases along the length of the ladder varies and makes up the

28      Of course, as more traits are added to the perpetrator‟s profile, the profile‟s
specificity and rarity increase, and the pool of possible perpetrators decreases.
(Pizarro II, supra, 110 Cal.App.4th at p. 562.) For example, in 1989, in preparation for
the first trial, the samples in this case were tested using RFLP analysis. Only three traits
or loci made up the perpetrator‟s genetic profile, and the frequency of that profile was
calculated to be approximately one in 10,000,000 Caucasians and one in 250,000
Hispanics. (Id. at p. 552 & fn. 22.) In 2004, in preparation for the second trial, the
samples were retested using the more modern STR analysis. This time, 13 loci made up
the perpetrator‟s profile, and the frequency of that profile was calculated to be
approximately one in 3.9 quintillion African-Americans, one in 350 quadrillion
Caucasians, and one in 4.2 quadrillion Hispanics. The evidentiary weight of the second
match increased astronomically.



                                              49.
genetic code that gives DNA its meaning. Two bases form each rung and are bound
together in the center in a complementary fashion—A binds to T, and G binds to C. The
sugar-phosphate backbone rail is covalently bound, while the complementary bases
coming together as rungs in the center are less tightly bound to one another by hydrogen
bonds. This allows the linear halves of the ladder to separate for replication.
        Although most regions of DNA are identical from one person to the next, some
regions vary in sequence and/or length. DNA analysis for the purpose of identification
often relies on the comparison of these variable regions. STR‟s are stretches of DNA
composed of repeated blocks of short sequences, often four nucleotides long. The
number of repeats varies among people, usually within the range of 10 to 20 repeats. The
function of these repetitive regions is unknown, but their variability provides an
opportunity to identify differences between two people, such as perpetrator and suspect in
a criminal case, or father and child in a paternity case.
        Because a person inherits a set of chromosomes (22 plus an X or Y) from each
parent, every locus has two versions (alleles). These alleles can be the same or they can
be different. In STR analysis, the number of repeats in an STR allele (reflected in the
length of the allele) gives the allele its name/number. The results of the analysis are
produced in a graph (electropherogram) that shows, for each locus, two peaks if the
person‟s two alleles are different (heterozygous), or one larger peak, roughly twice the
height of two heterozygous peaks, if the person‟s two alleles are the same (homozygous).
For each peak, the electropherogram labels the allele repeat number and the height of the
peak.
        Thus, if a person‟s two alleles at a particular STR locus are both the same length,
for example 14 repeats long, the person‟s genotype is 14,14 and homozygous. If the
person‟s alleles at a locus are different lengths, for example 14 and 19 repeats long, the
person‟s genotype is 14,19 and heterozygous. Several STR loci are tested to create a
genetic profile for the perpetrator and for any other relevant persons, such as the victim

                                             50.
and any suspects. For two profiles to match, they must have the same alleles at every
locus.29
       A tool critical to the implementation of STR analysis is PCR. PCR has
revolutionized DNA analysis because it is capable of making millions of copies of a
target segment of DNA. Thanks to PCR, very small amounts of DNA—theoretically, just
one piece—can be copied (amplified) exponentially to produce sufficient target DNA for
analysis. This is critical in forensic work where sometimes only trace amounts of DNA
can be collected.
       PCR‟s three-step amplification cycle occurs in a very small tube containing a
sample of the double-stranded DNA with the target segment (e.g., the evidence DNA),
short single-stranded pieces of DNA (primers) designed to bind to the two specific
regions flanking the target segment of DNA (primer binding sites), a heat-resistant DNA-
building enzyme (a DNA polymerase), the building blocks of DNA (nucleotides),30 and
other required elements. The tube is placed in a thermal cycler for amplification. In the
first step, the temperature is elevated to near-boiling to separate (denature) the double-
stranded DNA into single strands, breaking the hydrogen bonds between bases and
exposing the two template strands to the primers. Second, the temperature is lowered
until the primers are able to bind (anneal or hybridize) to the primer binding sites on the
single-stranded template DNA. Third, the temperature is elevated slightly and the DNA
polymerase synthesizes (extends) DNA from the end of each primer to make a new strand
of DNA complementary to the template strand. These new strands serve as additional
templates in the following cycles, rendering the amplification exponential. In the first

29     The STR loci are generally named with letters and numbers that describes their
location on a chromosome (e.g. D8S1179, D21S11); others are named with an
abbreviation for the name of the gene they are found within (e.g., TPOX is located within
the thyroid peroxidase gene; FGA is located within the alpha fibrinogen gene).
30     A nucleotide consists of a base and its connected sugar and phosphate molecules.



                                             51.
few cycles, some long strands are created, but eventually the region bounded by the two
primers becomes the overwhelmingly predominant product. This thermal cycle is
repeated about 30 times to create an enormous number of copies of the target region. It is
by this method that the STR loci are targeted within a person‟s DNA and amplified so
they can be ascertained by observable means, even if the original forensic sample
contains very little DNA.
       In this case, Myers used the Profiler Plus and COfiler kits and the Prism 310
Genetic Analyzer (the 310 Analyzer), all manufactured by Applied Biosystems, Inc.
(ABI), to analyze the 13 STR loci, which had been chosen by the scientific community as
the core loci for STR analysis, as well as the X and Y chromosomes for sex
identification.
       At trial, defendant challenged the admissibility of the DNA evidence and
requested a hearing pursuant to Kelly, supra, 17 Cal.3d 24. The Kelly test is an
evidence-screening device for sophisticated scientific evidence that tends to be highly
convincing, but not readily understood by lay jurors. (Pizarro II, supra, 110 Cal.App.4th
at p. 555.) “In the Kelly review process, the trial judge serves as gatekeeper, allowing
only evidence that is sufficiently reliable and trustworthy to reach the jurors.” (Ibid.)
Because of the immense power of scientific evidence, the Kelly test goes to the
admissibility, not the weight, of the evidence. (Kelly, supra, at pp. 30-32.)
       Kelly explained its three-prong test as follows: “(1) the reliability of the method
must be established, usually by expert testimony, and (2) the witness furnishing such
testimony must be properly qualified as an expert to give an opinion on the subject.
[Citations.] [(3)] Additionally, the proponent of the evidence must demonstrate that
correct scientific procedures were used in the particular case. [Citations.]” (Kelly, supra,
17 Cal.3d at p. 30; Venegas, supra, 18 Cal.4th at p. 78.)
       In defendant‟s 105-page Kelly motion to exclude the DNA evidence, he argued
that (1) a first-prong hearing was required (a) on the general acceptance of the mixture

                                             52.
interpretation procedure and (b) on the general acceptance of the STR procedure because
he was offering evidence that undermined its reliability, and (2) a third-prong hearing
was required to establish that correct scientific procedures were used in this case. The
trial court refused to hold a first-prong hearing, concluding that a number of published
cases had already determined the general acceptance of the STR procedure. The court
did agree, however, to hold a third-prong hearing, and it concluded that correct scientific
procedures had been followed in this case.
       B.     Kelly’s First Prong*
       Under the first prong of Kelly, a new scientific method is considered reliable when
it has attained acceptance in the relevant scientific community. (Kelly, supra, 17 Cal.3d
at pp. 30-32 [noting California had adopted this test from the federal case of Frye v.
United States (D.C. Cir. 1923) 293 Fed. 1013 (Frye)]31.) “Kelly „does not demand that
the court decide whether the procedure is reliable as a matter of scientific fact: the court
merely determines from the professional literature and expert testimony whether or not
the new scientific technique is accepted as reliable in the relevant scientific community
and whether “„scientists significant either in number or expertise publicly oppose [a
technique] as unreliable.‟” [Citations.]‟ [Citation.] „“General acceptance” under Kelly
means a consensus drawn from a typical cross-section of the relevant, qualified scientific
community.‟ [Citation.]” (People v. Soto (1999) 21 Cal.4th 512, 519.)
       The question of general scientific acceptance may be answered by prior case law:
“[O]nce a trial court has admitted evidence based upon a new scientific technique, and


*      See footnote, ante, page 1.
31      “Until 1993, [the Kelly test] was generally known in this state as the Kelly-Frye
[test] because this court in Kelly had relied on the reasoning of [Frye]. In 1993, the
United States Supreme Court held that the Federal Rules of Evidence had superseded
Frye [citation], and our state law rule is now referred to simply as the Kelly test or rule.
[Citation.]” (People v. Bolden (2002) 29 Cal.4th 515, 545.)



                                             53.
that decision is affirmed on appeal by a published appellate decision, the precedent so
established may control subsequent trials, at least until new evidence is presented
reflecting a change in the attitude of the scientific community.” (Kelly, supra, 17 Cal.3d
at p. 32; Venegas, supra, 18 Cal.4th at p. 53.) Thus, a defendant is not foreclosed from
showing that a scientific test has since been invalidated or that there has been a change in
the consensus of the scientific community concerning the test. (People v. Allen (1999) 72
Cal.App.4th 1093, 1100-1101; People v. Smith (1989) 215 Cal.App.3d 19, 25.)
       We independently review the trial court‟s first-prong rulings on general
acceptance. (Venegas, supra, 18 Cal.4th at p. 85.) “[I]n reviewing the scientific
acceptance of [a method] de novo under Kelly, we are not required to decide whether [it]
is „reliable as a matter of “scientific fact,” but simply whether it is generally accepted as
reliable by the relevant scientific community.‟ [Citation.]” (Ibid.)
       C.     Refusal to Hold First-Prong Kelly Hearing*
       Defendant contends the trial court erred in refusing to hold a first-prong Kelly
hearing. He concedes that the exact type of testing performed in this case, including use
of the Profiler Plus and COfiler kits and the 310 Analyzer, had already been found
generally accepted under Kelly‟s first prong by People v. Smith (2003) 107 Cal.App.4th
646, 671-672 (Smith) (analysis of mixed DNA sample “by means of short tandem repeats
utilizing Profiler Plus and COfiler in conjunction with the … 310 Genetic Analyzer is
accepted by the scientific community”) and People v. Henderson (2003) 107 Cal.App.4th
769, 776, 789 (Henderson) (in STR analysis, using Profiler Plus and COfiler kits in
conjunction with the 310 Analyzer, capillary electrophoresis is generally accepted by
scientific community), but he claims the evidence he presented to the trial court
undermined the continuing reliability of the STR technology and revealed a change of
consensus within the scientific community concerning the technique. He explains that
*      See footnote, ante, page 1.



                                             54.
the 38 exhibits he presented to the trial court contained data and publications that either
were not available at the time of Smith and Henderson or were not considered in Smith
and Henderson. According to defendant, the exhibits proved that various studies found
significant reliability problems with the Profiler Plus and COfiler kits and the
310 Analyzer.
       First, we note that cases more recent than Smith and Henderson have reiterated the
continued acceptance of the STR analysis by the scientific community. Recently, the
court in People v. Stevey (2012) 209 Cal.App.4th 1400 determined that STR testing of the
Y chromosome did not require a first-prong Kelly hearing:

               “As the Attorney General points out, California courts have found
       that the use of PCR and STR technology has been generally accepted by the
       scientific community. (Smith, supra, 107 Cal.App.4th at p. 665;
       Henderson, supra, 107 Cal.App.4th at pp. 786-787.) In both cases the court
       refused to undertake a Kelly prong-one hearing to determine whether use of
       the technology in mixed-source cases specifically had been accepted by the
       scientific community. And in both cases, the courts recognized the
       additional complications arising from mixed-source samples that might
       impact on the results‟ reliability, but concluded that the weaknesses or
       potential flaws were considerations for the jury in weighing the evidence
       and determining the accuracy of the results. (Smith, supra, 107
       Cal.App.4th at pp. 671-672; Henderson, supra, 107 Cal.App.4th at p. 788.)
       These complications did not trigger the need for a Kelly evidentiary
       hearing. [Citation.]” (People v. Stevey, supra, at p. 1418.)
       In 2008, the court in People v. Jackson (2008) 163 Cal.App.4th 313 recognized
that STR analysis was generally accepted and concluded that new STR kits need not be
subjected to first-prong scrutiny to determine scientific reliability:

             “The DNA amplification in this case was performed by the
       PCR/STR method. This methodology has been found to be generally
       accepted in the scientific community. (People v. Hill (2001) 89
       Cal.App.4th 48, 57 (Hill); People v. Allen (1999) 72 Cal.App.4th 1093,
       1100.) In addition, capillary electrophoresis, the procedure used to analyze
       the amplified DNA fragments, has been found to have gained general
       acceptance in the scientific community. (People v. Henderson[, supra,]
       107 Cal.App.4th [at p.] 789.)” (People v. Jackson, supra, at p. 324.)


                                              55.
       Second, we conclude that the exhibits defendant presented to the trial court do not
prove the STR method is no longer generally accepted by the scientific community. In
these 38 exhibits, which we have reviewed, there is certainly evidence of valid issues and
ongoing concerns about flaws in the STR system, such as allelic dropout (which we
address below), but no evidence that the community has rejected STR analysis as
unreliable or no longer generally accepts the method as reliable or acceptable. In fact, it
remains the standard applied to forensic DNA analysis.
       The phenomenon of allelic dropout and null alleles has been known for many
years and defendant‟s exhibits support the conclusion that the STR procedure remains
generally accepted despite allelic dropout. Based on the lack of evidence that the
scientific community no longer generally accepts the STR procedure as reliable, we
conclude the trial court did not err in refusing to hold a first-prong Kelly hearing. (See
Kelly, supra, 17 Cal.3d at p. 32; Venegas, supra, 18 Cal.4th at p. 76.)
       D.     Kelly’s Third Prong*
       The third Kelly prong asks: Were the proper scientific procedures followed in this
particular case? (Venegas, supra, 18 Cal.4th at p. 78; Pizarro II, supra, 110 Cal.App.4th
at p. 554.) “The Kelly test‟s third prong does not apply the Frye requirement of general
scientific acceptance—it assumes the methodology and technique in question has already
met that requirement. Instead, it inquires into the matter of whether the procedures
actually utilized in the case were in compliance with that methodology and technique, as
generally accepted by the scientific community. [Citation.] [¶] … [¶] [Q]uestions
concerning whether a laboratory has adopted correct, scientifically accepted procedures
for [DNA testing] or determining a [profile] match depend almost entirely on the
technical interpretations of experts. [Citation.] Consideration and affirmative resolution


*      See footnote, ante, page 1.



                                             56.
of those questions constitutes a prerequisite to admissibility under the third prong of
Kelly.” (Venegas, supra, at pp. 78-81.)
       Although Kelly‟s first two prongs apply to a new scientific procedure (Kelly,
supra, 17 Cal.3d. at p. 30), the third prong applies even to evidence derived from a
long-standing scientific procedure that has already been found to have attained general
acceptance. (Venegas, supra, 18 Cal.4th at p. 79 [whether specific steps in FBI‟s analysis
were in compliance with long-standing and accepted methods presented questions of
correct scientific procedures properly considered under third prong].)
       “The Kelly test‟s third prong does not, of course, cover all derelictions in
following the prescribed scientific procedures. Shortcomings such as mislabeling,
mixing the wrong ingredients, or failing to follow routine precautions against
contamination may well be amenable to evaluation by jurors without the assistance of
expert testimony. Such readily apparent missteps involve „the degree of professionalism‟
with which otherwise scientifically accepted methodologies are applied in a given case,
and so amount only to „[c]areless testing affect[ing] the weight of the evidence and not its
admissibility‟ [citations].” (Venegas, supra, 18 Cal.4th at p. 81.)
       “„“All that is necessary in the limited third-prong hearing is a foundational
showing that correct scientific procedures were used.” [Citation.]‟ [Citation.] Where the
prosecution shows that the correct procedures were followed, criticisms of the techniques
go to the weight of the evidence, not its admissibility. [Citations.]” (People v. Brown
(2001) 91 Cal.App.4th 623, 647 (Brown).) Similarly, where there is substantial evidence
showing both that procedures were followed and that they were not followed, the
question is one for the jury to resolve. (Venegas, supra, 18 Cal.4th at p. 91.) But where
defense evidence establishes a failure in procedure, and that failure is not contradicted by
substantial evidence, then the evidence produced as a result of that incorrect procedure is
inadmissible. (See id. at pp. 91-93.)



                                             57.
       In contrast to first-prong issues, the trial court‟s third-prong conclusions that
proper procedures were followed in a particular case are reviewed for abuse of discretion.
(Venegas, supra, 18 Cal.4th at p. 91.) The appellate court is “required to accept the trial
court‟s resolutions of credibility, choices of reasonable inferences, and factual
determinations from conflicting substantial evidence. [Citation.]” (Ibid.) “We thus
consider whether there is substantial evidence in the record to support the conclusion that
the procedures were in fact performed in a manner fully consistent with the underlying
science such that they produced reliable results. [Citation.]” (Pizarro II, supra, 110
Cal.App.4th at p. 559.)
       E.     Failure To Follow Correct Procedures Under Kelly’s Third Prong
       Defendant contends the trial court abused its discretion when it determined that
correct scientific procedures had been followed in this case. The following evidence was
elicited at the Kelly hearing.
              1.      Steven Myers’s Testimony
                      a.     Introduction
       Steven Myers, a highly trained senior criminalist at the DOJ lab in Richmond,32
testified that he began his DNA analysis of the evidence in this case in November 2004.
He analyzed the DNA on the vaginal swabs and found a mixture of sperm cell DNA and
epithelial cell DNA. He created a 13-loci genetic profile for the perpetrator (the major
contributor from the vaginal swab‟s sperm cell fraction). When he later analyzed the
DNA from defendant‟s reference blood sample, he found that it matched the alleles at all
13 of the loci of the perpetrator‟s profile. Myers‟s statistical analysis established that the
estimated frequency of that profile, or the chance that a randomly chosen person would
have that profile, was approximately one in 3.9 quintillion African-Americans, one in

32     Henceforth, the lab, the DOJ lab, and the DOJ refer to the Richmond DOJ lab
unless otherwise noted.



                                             58.
350 quadrillion Caucasians, and one in 4.2 quadrillion Hispanics. Myers also analyzed
Amber‟s reference blood sample and found that it matched the alleles at all 13 loci of the
epithelial cell fraction from the vaginal swab.
                     b.     Victim Sexual Assault Kit*
       The victim sexual assault kit contained a sealed envelope holding a vaginal swab.
This was the only vaginal swab Myers tested. The vaginal swab bore initials that Myers
recognized as belonging to Delia Frausto-Heredia from the DOJ‟s Fresno lab. Myers
chose to test this swab because he believed it had “gone fewer places,” had “had the least
done” to it, and had been subjected to “less movement around the country” than the other
swabs. It appeared to Myers that about one-third of the swab had been sampled
previously.33
       On cross-examination, Myers testified that the swab contained a large quantity of
sperm, particularly for the age of the sample. In his opinion, this large quantity of sperm
would not be transferrable by contamination, as defense counsel proposed. But Myers
agreed that, hypothetically, contamination of a vaginal swab could occur if the analyst
touched the end of the swab with a contaminated finger, or if the analyst examined
semen-stained underwear at the same time as the vaginal swab. But the analyst would
have to place his contaminated finger directly on the end of the swab, and the sperm
would not transfer in a large quantity because the swab would be dry. Myers stressed
that although the swab was originally analyzed many years ago, labs at that time were
cognizant of contamination issues. Myers did not believe it was likely that the vaginal


*      See footnote, ante, page 1.
33    On cross-examination, Myers stated that he believed this swab had stayed in the
Fresno lab and the other three vaginal swabs had been sent to the FBI. A letter written to
the FBI by Frausto-Heredia accompanying the samples to be analyzed stated that three
vaginal swabs were being sent; the third already had been analyzed. Myers chose to
analyze the swab that had stayed in the Fresno DOJ lab.



                                            59.
swab in this case had been contaminated with sperm from defendant‟s underwear,
especially with the large amount of sperm on the swab. And if someone had
contaminated the swab by dipping it into fresh semen, it probably would contain even
more sperm than it did.
       On direct examination, Myers explained that in the next step of the analysis, he
returned the swab material to the tube with the cellular material. He added various
chemicals, including an enzyme to break open the cell membranes and lyse the non-
sperm cells (i.e., the vaginal epithelial cells), but not the hardier sperm cells After a two-
hour incubation at a high temperature, Myers shook the swab material again, removed it,
and stored it in the freezer. After centrifugation of the tube, a cell pellet was formed with
a solution above it. Myers expected the cell pellet to contain sperm cells and the solution
above it to contain the lysed epithelial cells and their contents (including DNA). After he
removed and saved the solution, Myers examined the cells in the pellet and realized the
pellet contained some epithelial cells that had not been lysed. He repeated the lysing
procedure, after which it appeared all the epithelial cells had been lysed.
       To the sperm cell pellet, Myers added chemicals, including dithiothreitol (DTT),
to lyse the hardier sperm cells. After this step, Myers had two solutions of lysed cells,
one containing epithelial cell DNA and the other containing sperm cell DNA. He
extracted the DNA from the solutions and quantitated how much DNA was in each
extraction.
       After Myers removed the cells from the vaginal swab and attempted to separate
the epithelial cells from the sperm cells, he used ABI‟s Profiler Plus and COfiler kits to
amplify 13 STR loci and a sex identification locus. The kits included fluorescent primers
specific to areas on the DNA containing the STR loci. Myers tested the samples in this
case separately from samples in any other case.
       After PCR, Myers separated the PCR products (DNA pieces) by size with the
310 Analyzer, a capillary electrophoresis instrument. The solution containing the various

                                             60.
PCR products was loaded (injected) at one end of the capillary tube and the pieces of
DNA traveled through a polymer in the tube, drawn by an electrical charge. DNA pieces
of the same size traveled together, and each piece‟s fluorescent tag was recorded as it
passed a laser window. The 310 Analyzer measured the amount of time until the DNA
pieces reached the laser window, which reflected their lengths, and also the amount of
fluorescence they generated, measured in relative fluorescence units (RFU), which
reflected the number of copies of each length. Samples of a known allelic ladder
(standardized pieces of DNA of various known sizes) and controls were also analyzed for
comparison. GeneScan and Genotyper software, also manufactured by ABI, analyzed
these data to estimate the length of the DNA pieces and the number of repeats in each
piece. The software produced an electropherogram, a graphical display with colored
peaks rising from a baseline, and assigned to each peak a number of repeats (made an
“allele call”) and an RFU count.
       On cross-examination, Myers explained that with GeneScan the analyst could set
an RFU below which peaks would not be identified. This eliminated peaks that were
consistent with stutter, a phenomenon where an extra, shorter copy of an allele is copied
during PCR, in addition to the correct copy. This shorter copy is usually one repeat unit
(e.g., four nucleotides) shorter than the correct copy. When GeneScan‟s threshold filter
was turned off, the peaks below the threshold would reappear. ABI recommended using
a threshold of 150 RFU and, below that, interpreting with caution. The DOJ‟s threshold
was 75 RFU, but Myers generally set the threshold at 50 RFU for completeness,
especially with mixed samples. He did, however, only call or identify alleles that were at
least 75 RFU. After GeneScan detected and labeled all peaks above the 50 RFU
threshold, Genotyper examined those peaks a second time and removed the labels if one
of the two peaks at a locus was less than 15 percent the height of the other, a situation
that supported a finding of stutter.



                                             61.
                     c.      Mixture Interpretation*
       From the resulting electropherograms, it was immediately evident to Myers that
the sperm cell fraction contained a mixture of more than one person‟s DNA. In other
words, the separation of sperm and epithelial cells had not been complete. When Myers
looked at the allele peaks and their intensities at each locus, he determined that the results
were consistent with a major contributor, plus some epithelial DNA carryover as a minor
contributor. All of the controls tested as expected, and there was nothing about the
results that suggested any mistakes had been made. At this point, knowing he would
have to interpret the mixture, Myers amplified the sperm cell fraction three more times to
remove any variability issues.
       Myers explained that the DOJ‟s general interpretation guidelines included a
protocol for interpreting a two-person mixture in which one person can be assumed to be
the minor contributor. He explained that the goal in STR mixture interpretation is to
determine the major contributor‟s alleles by assessing the minor contributor‟s alleles and
the peak height ratios. Mixture interpretation can involve a lot of ambiguity because
subtle variations in the major contributor can effectively hide the minor contributor‟s
profile. But where the difference between the contributors is fairly significant, the minor
contributor‟s alleles can be subtracted from the mixture, making the major contributor‟s
alleles fairly obvious. When the DNA source is a vaginal swab, the minor contributor to
the mixture can be assumed to be the victim‟s vaginal epithelial cells if the alleles from
the victim match alleles in the mixture.
       This was the situation in this case. The difference between the contributors was
significant, and the minor contributor‟s alleles matched those in the vaginal epithelial cell
fraction. Accordingly, the minor contributor‟s alleles could be subtracted from the


*      See footnote, ante, page 1.



                                             62.
mixture to reveal the major contributor‟s alleles. This mixture interpretation was
consistent with DOJ protocols and procedures.
       On cross-examination,34 Myers explained that it was because of the potential
variability in PCR that he amplified the DNA in this case three additional times to ensure
that the imbalances he saw in the mixture the first time were not due to a rare occurrence,
as he explained below. He injected the results of each amplification into the 310 Analyzer
twice, creating eight electropherograms. He calculated peak height ratios at each locus by
setting the highest peak as 100 percent and determining the percentage of this height for the
other peaks. Then he averaged the peak height ratios of the eight injections. Myers stated
that the DOJ‟s STR protocol did not mention using an averaging method. Nor did he think
either the ABI user manual or the FBI‟s STR protocol mentioned it. Myers had not seen
anyone average profiles in the manner he had in this case.
       Myers explained that STR mixtures are inherently more difficult to interpret than
single-source samples. The results from a single-source sample represent the profile
from a single person, but in a mixed sample, where the composition of the mixture may
be unknown, there may be ambiguity regarding which alleles come from which person.
Theoretically, a person‟s two alleles at a locus should amplify consistently and in exactly
equal numbers, producing two peaks of equal height and a peak height ratio of
100 percent. In reality, the two alleles are usually well-balanced with a peak height ratio
of at least 70 percent (the height of the shorter peak is at least 70 percent the height of the
taller peak). But more peak variability and imbalance can occur for various reasons, and
they greatly complicate mixture interpretation.
       Myers explained that although the mixture in this case contained three alleles at
the D3S1358 locus, he determined that one peak was not the major contributor‟s because
it was only about 20 percent of the shorter major peak. With an intimate sample such as
34     Until otherwise noted, the following facts were elicited during cross-examination.



                                              63.
a vaginal swab, incomplete separation of the mixture is not uncommon, and he proceeded
with his interpretation based on the assumption that the minor contributor was from
carryover from the epithelial portion of the vaginal swab.
       The DOJ written guidelines on mixture interpretation stated that a sample could be
considered a mixture of major and minor contributors if there was a distinct contrast in
peak heights among the alleles. The guidelines set no absolute threshold for what was
considered a distinct contrast. Theoretically, two analysts could disagree on that
question, but Myers was highly doubtful any disagreement could occur in this case.
                     d.     Low DNA or Degraded DNA*
       When the initial amount of DNA amplified is extremely low, there will be more
variability in the peak height ratio due to stochastic or chance effects. For example, a
peak imbalance can occur when the sample of template DNA added in the PCR reaction
contains, by chance, a few more copies of one allele than the other. With very low
quantities of template DNA, an allele of a heterozygote can drop out entirely.
       Similarly, with severely degraded DNA samples, larger alleles may not amplify as
well as the smaller alleles because the long stretches of DNA making up the larger alleles
are more likely to be broken. In this case, Myers found that the DNA was somewhat
degraded, which he expected because the sample was taken postmortem and was many
years old.
       As the amount of template DNA diminishes, the chance of these irregularities
increases. Different amplifications of the same template DNA can produce different peak
heights. Myers had observed peak height ratios as low as 35 percent in low-DNA
samples that otherwise amplified normally. In those cases, he did not call major and
minor contributors because he knew these imbalances could occur with very low levels of
template DNA.
*      See footnote, ante, page 1.



                                            64.
                     e.      Allelic Dropout and Null Alleles
       Myers explained on cross-examination that if the PCR amplification process itself
does not occur equally at both alleles, the peak heights will be different. This could
occur, for example, if one allele gets a jump-start in the amplification, or if one allele
cannot be amplified as effectively as the other due to a sequence variation that prevents a
PCR primer from annealing properly to the template DNA. The most extreme form of
allele or peak imbalance occurs in the null allele phenomenon, a fairly rare event in
which one of the two alleles simply does not amplify and therefore does not appear as a
peak on the electropherogram (the allele “drops out”). The phenomenon is fairly rare
because most people have the same sequence in these regions, but occasionally people
will have a single base difference in the sequence. The sequence difference can affect the
binding of a PCR primer to the template DNA‟s primer binding site in a critical way,
such as when the mismatch occurs at the end of the primer where DNA extension will be
initiated. If the instability is great enough to prevent copying of that allele, the missing
peak will suggest that the allele does not exist. Myers believed null alleles occurred in
about one in 1,000 profiles. He explained that null alleles are more common at certain
loci. He was aware that null alleles had been found to occur more commonly at the
D8S1179 locus in the Chamorro population.
       Myers was familiar with the studies demonstrating that ABI kits and Promega kits
produced different null allele results. In some cases, one kit amplified one allele and the
other kit amplified two alleles, either balanced or imbalanced. Defense counsel asked
whether this could lead to a missed exclusion if, for example, the perpetrator were not
really a homozygous 8,8 at the TPOX allele and thus defendant‟s 8,8 would not be a
match. Myers responded: “But the person who would have that sample would still type
as this same result using this kit. So as long as everyone is typed with the same kit there
wouldn‟t be any false result because the result would be the same.” Defense counsel
pursued the topic and the following exchange took place:

                                             65.
       “Q. Let me see if I follow that. Let‟s assume for the moment your
testing shows—using the [ABI] Profiler Plus kit [defendant] is [an] 8[,]8 [at
the TPOX locus], right?

       “A.    That is correct.

       “Q. If the [evidence] sperm sample is in fact an 8[,]9 and in fact
[defendant] is an 8[,]8, your conclusion would be that he‟s excluded as a
possible source for the sperm sample; isn‟t that true?

        “A. If the [perpetrator] is an 8[,]9 that would actually type as an
8[,]9, then [defendant] would be obviously excluded.

       “Q.    Because?

       “A. If [the perpetrator is] … [an] 8[,]9 that types as [an] 8[,]8,
then everyone who has just the [8] allele visible type with this kit would be
included.

       “Q. Right. So what you‟re saying then is hypothetically if you
type them with the [ABI] Profiler Plus kit as [an] 8[,]8 and you typed this
[evidence] sperm sample [as an] 8[,]8, … in context with that loc[us],
[defendant] is not excluded, right?

       “A.    That is correct.

       “Q. That hypothetically if I, as a defense lawyer, chose to go out
and type [defendant] with the Promega kit and I [typed him as an] 8[,]9,
then what would your conclusion be? Excluded or included?

      “A. My conclusion would be also that you need to type the
evidence [sperm sample] now using the Promega kit to see what the
evidence would type out as.

       “Q.    So the results would vary depending on what kit you used?

       “A.    They should be internally consistent within a kit.

        “Q. So your testing procedure cannot determine whether [a null]
allele is present or not just using that kit?

        “A. Well, there are instances where we can have a good indication
a [null] allele is present. Because, for example, we know that general
balance between the loci. And if we see at a locus that a single allele was
detected, but at a much lower level than normal productibility, that is an


                                     66.
       indication that you have a [null] allele present. But in instances where you
       have degradation[,] that gets more difficult.

              “Q.    You have degradation in this case?

              “A.    There is some in this case, yes.”
       Myers agreed that although null alleles are rare, they are increasingly being
discovered over time. Myers was familiar with the following statement from John M.
Butler‟s 2005 book, Forensic DNA Typing: Biology, Technology, and Genetics of STR
Markers (Butler 2005), at page 135: “A number of primer concordance studies have been
conducted in the past few years as use of various STR kits has become more prevalent.
An examination of over 2,000 samples comparing the [Promega] Powerplex 16 kit to the
[ABI] Profiler Plus and COfiler kit results found 22 examples of allele dropout due to a
primer mismatch at seven of the 13 core STR loci .…”
       Myers made the assumption that allelic dropout had not occurred at the loci that
produced a single peak—vWA, TPOX, and CSF1PO. He explained that because he saw
no indication of allelic dropout such as a sudden decline in peak height, he made the
assumption that the single peak represented a homozygous genotype “based on what is
the most common event.”
       Myers explained that, at the vWA locus, he typed the evidence sperm DNA as a
17,17, even though the electropherogram for the sperm DNA showed a small 16 peak in
addition to the 17 peak. He agreed that if the evidence sperm DNA were actually a 16,17
heterozygote, rather than a 17,17 homozygote, defendant would be excluded as a
contributor because he was a 17,17 homozygote. In two of the eight runs of the evidence
sperm DNA, the 16 peak was too small to be labeled by the software. In the other six
runs, Myers had marked the 16 peak as inconclusive.
       Myers explained that his determination that the 16 allele was inconclusive did not
mean there was no 16 allele present. In fact, in this mixed sample, a 16 allele was
consistent with carryover due to incomplete separation of the epithelial DNA. But the


                                            67.
vWA profile was not consistent with a typical sperm contributor with a 16,17 genotype
because the imbalance between the alleles was too dramatic for a typical person‟s DNA.
The two alleles, one from each parent, are generally present in equal amounts in the
DNA, and when those alleles are amplified, fairly similar amounts of each allele are
expected. Thus, the resulting peak heights for the alleles are also fairly similar, often
within 80 percent of each other, and usually within 70 percent. Occasionally, the
imbalance is greater, but this generally occurs with very low amounts of template DNA
(causing stochastic or chance effects), genetic anomalies, and jump-starts in the copying
of one allele. In cases like this with ample template DNA, Myers would never expect
these two peaks to be from a typical heterozygote (16,17) contributor.
       On redirect examination, Myers explained that at the vWA locus, the 16 peak was
so much smaller than the 17 peak that in the vast majority of situations it would not be
consistent with being from a single donor. But it would be consistent with a mixture due
to incomplete separation of sperm and epithelial DNA. The profile of the epithelial
fraction was a 16,17 at the vWA locus and the alleles were almost perfectly balanced in
peak height, which one would expect with a heterozygote.
                     f.     Same Length but Different Sequence Alleles
       On cross-examination, Myers agreed that the STR procedure measures the length
of a DNA piece, not its sequence, and he agreed that a person whose allele matches in
length but not in sequence is not a match:

             “Q. Do you accept the proposition that someone who has this
       same length DNA but different sequences is not the same individual?

              “A.    Yes.

              “Q. In other words, if I have a length—just using an example,
       length 16, but my sequence is a CTG [cytosine-thymine-guanine] and
       [defendant] has that same loci 16, but his sequence is not a CTG, but some
       other sequence, your conclusion would be that those two samples did not
       come from the same individual?


                                             68.
       “A. No. Barring any kind of mutation that occurred within the
body, etcetera, etcetera, yes. Just as a generality you can have this same
length in a piece of DNA and still have two sequences. And studies have
looked at families of repeat where you could see one set of lengths came
from the same sequence family and at the same locus a similar length could
be from a different sequence family. So that‟s documented, certainly.

        “Q. And are you familiar with Dr. Butler‟s discussion of this issue
in [Butler 2005] under a heading called „Same Length, But Different
Sequence Alleles.” Page 131. [¶] … [¶] Then if you turn to page 562 of
the book, actually lists there, does he not, all of the—and let me back up.
[¶] … [¶] What he‟s discussing there is the fact that people are finding that
at certain of the loci that are typically tested—STRs typically tested there
are alleles that have exact same length but different sequences, correct?
Right?

       “A. That‟s part of it. He also says this—this is important, it is
important to realize that from an operational point of view internal allele
variation is not significant. Then goes on to say because we are talking
about possible loci and those issues the overall concordance of multiple loci
lengths take[s] care of any worry about sequence variation falsely including
someone.

      “Q. You, yourself[,] I think accepted the proposition that if
someone is consistent across several alleles, but inconsistent in one, your
conclusion is that they‟re excluded as a possible source, right?

        “A. I‟m one of those anything can happen [people]. As a purist,
yes. On a practical level, that when I begin a case comparing one person
against one sample, when you have entire profiles consistent, then the
chance that you‟re actually going to have exclusions as you‟re talking about
is vastly true, they‟re highly reduced. [¶] And also this is what our
population statisticians count in because in creating data bases all of those
people who had, for example, a 16 allele in the data base may have had
different sequences. So what we are doing is we are saying, [„]here is the
frequency of people with this length trait regardless of this sequence.[‟] [¶]
So this is why specifically over the course of the entire 13 locus profile this
is not a great concern.

       “Q.    It‟s a concern to the person who is wrongfully included, is it
not?

       “[PROSECUTOR]: Objection. Argumentative.



                                     69.
              “THE COURT: Sustained.

              “Q. You said yourself that if [defendant] and I shared a different
       sequence at [a] locus you would exclude based on that difference. [¶] Do
       you recall this question?

              “A. Almost definitely would have been excluded. Excluded by
       other loci also.

              “Q.    That‟s an assumption you‟re making, right?

              “A.    It‟s a pretty good assumption.

             “Q. That‟s based on your assumption that you wouldn‟t see
       concordance between multi[ple] loci and just one where it doesn‟t match?

               “A. It‟s based on the knowledge that when you are using 13 STR
       loci the chances of a random one grabbing two individuals and the[m]
       having the same profile is just exceedingly rare.”
       Myers explained that a 13-loci match is exceedingly rare even though it might be
expected to eventually occur in the billions of comparisons that can be performed within
a massive database of millions of people. A match in that context is different.
       Myers agreed that Butler 2005 lists alleles at various loci that have been found to
have the same length but different sequence. These are different alleles, but they are not
distinguishable by the STR procedure. Myers‟s STR analysis did not attempt to
distinguish the sequence of any of the alleles, and he agreed that if defendant‟s alleles
contained different sequences, “he would still be included based on the lengths, but under
the incredible unlikely event that someone would match at all of the lengths and still have
different sequences than the evidence [sample], yes, he would be an exclusion.” Myers
stated that allele length was the focus of most forensic labs because a “huge practical
limitation” prevented them from sequencing. If they sequenced, they would complete
only a few cases per year.




                                             70.
                     g.     Statistics*
       Myers generated a report based on his mixture interpretation, including a statistic
stating the chance that a randomly chosen person in the population would have the
genetic profile of the mixture‟s major contributor. He used databases of allelic
frequencies to estimate how frequently a particular profile would appear in the
population. And he used the formula from the NRCII report with a modification referred
to as theta.
       On cross-examination, Myers explained that he used Caucasian, African-
American, and Hispanic databases to perform his statistical calculations. The databases
consisted of about 200 people each. Defense counsel asked if the databases had been
tested for independence expectations, as recommended by the SWGDAM (Scientific
Working Group on DNA Analysis Methods) Revised Validation Guidelines (Forensic
Sciences Communications (July 2004) vol. 6, No. 3), guideline 2.7. Myers answered that
the databases had been tested as part of a paper by Budowle et al. published in the Journal
of Forensic Sciences. The DOJ had not conducted any independence expectation tests on
the databases. Myers explained that the guideline referred to tests that examine issues
such as Hardy-Weinberg equilibrium,35 to compare the observed data versus the expected
data in a database. Myers was aware of the criticism of the FBI‟s independence testing as
insufficient to test for potential departures from Hardy-Weinberg equilibrium, but
Budowle responded to the criticism and Myers agreed with his position.




*      See footnote, ante, page 1.
35     Hardy-Weinberg equilibrium refers to the frequencies of alleles and genotypes
within a population.



                                            71.
                     h.     Reference Blood Samples*
       In May 2005, Myers began analyzing the reference blood samples collected from
Amber and defendant. Myers received these samples from Agent Smith. Myers had two
reference samples for defendant—one from 1989 and one from 2005. Because the
reference samples were blood samples, they did not require the differential DNA
extraction needed to separate the sperm and epithelial cells. Myers lysed the cells and
extracted the DNA from the blood. As with the other samples, he quantitated the DNA,
amplified it with the Profiler Plus and COfiler kits, and analyzed the PCR products with
the 310 Analyzer and the computer software. Myers tested the three reference samples at
the same time, in addition to the various controls. The controls tested as expected, and
nothing in the results suggested the testing was not correct.
       From these results, Myers generated a genetic profile for both Amber and
defendant. Amber‟s profile was consistent with having come from the same person as
the epithelial cell fraction from the vaginal swab that Myers had tested months earlier.
The profiles matched at all 13 loci. And all 13 loci of defendant‟s profile matched those
of the major contributor from the vaginal swab‟s sperm cell fraction.
       According to the DOJ‟s routine practice, Myers ran every sample at least twice
through the 310 Analyzer for reproducibility of the result. Myers applied stringent
standards to determine whether a peak was an allele or an artifact. The reruns he
performed in this case verified that he made the proper calls. He had confidence in the
results.
                     i.     Validation*
       Myers explained the validation procedures for a forensic typing system. The DOJ
validated the STR protocol by following guidelines for validation of a new system prior

*      See footnote, ante, page 1.
*      See footnote, ante, page 1.



                                            72.
to its use. The DOJ‟s validations went beyond that required by internal validation. Some
of the DOJ‟s studies, including those for the validation of the Profiler Plus and COfiler
kits, were consistent with developmental validation, and the results of those studies were
ultimately presented at a scientific meeting.
       With the Profiler Plus and COfiler kits, the DOJ analysts made very few
deviations from ABI‟s guidelines, and none that changed the fundamental procedure.
Those changes were incorporated into the DOJ‟s written procedure. For example, the
DOJ‟s interpretation guideline required a certain RFU as an absolute minimum, whereas
ABI‟s guidelines allowed interpretation with caution below a certain level. Also, the
DOJ performed “smoothing” of the data at a different level, which was recommended by
ABI‟s employees for experienced analysts. In general, the DOJ analysts maintained a lot
of contact with ABI. The DOJ analysts validated the smoothing level, but they already
knew it was beneficial.
       As a part of the DOJ‟s accreditation, external reviewers examined the lab‟s
validations and determined whether they were sufficient to justify the use of the test. The
reviewers informed the DOJ if they believed the validation was insufficient.
       On cross-examination, Myers again addressed the deviations the DOJ had made
for using the Profiler Plus and COfiler kits. First, the lab‟s interpretation guideline
required an absolute minimum of 75 RFU, whereas ABI‟s guidelines allowed
interpretation with caution below 150 RFU. Second, the lab lengthened the final
extension of the PCR thermal cycling from 45 minutes to 90 minutes, based on validation
experiments conducted in the lab that showed some PCR products were otherwise not
copied to full length. This was especially the case when the reaction contained more than
the optimum amount of DNA. The extra extension time on the final cycle allowed
extension to finish and adenylation (addition of a final adenosine nucleotide) to occur.
Third, the lab performed light smoothing of the data, rather than heavy smoothing. ABI‟s
user manual recommended heavy smoothing, which resulted in more rounded, gradual

                                             73.
peaks, rather than sharp, pointed peaks on the electropherogram. ABI‟s employees,
however, recommended to Myers that more advanced analysts use light smoothing
because those analysts could differentiate spurious peaks from others. The lab validated
the light smoothing and determined it was a better method. Myers believed ABI‟s new
user manual now recommended light smoothing.
       Myers reiterated that the DOJ conducted internal validation studies on the Profiler
Plus and COfiler kits before they were used in casework. These studies did not include
stutter percentages. Instead, the DOJ relied on ABI‟s work on stutter percentages. Myers
agreed that stutter percentages had varied some in different studies, but the key for most
labs was the determination of how conservative they wanted to be with their thresholds.
                     j.     Proficiency Testing*
       Myers had undergone at least 20 proficiency tests for the STR procedure. The
proficiency tests were both internal and external, although he was aware he was being
tested. Myers explained that blind proficiency testing requires that no one in the lab,
including the supervisors, know the testing is occurring. This type of testing is very
difficult to implement. The DOJ lab had voluntarily participated in a feasibility study
regarding implementation of blind proficiency testing many years prior to this hearing.
The lab got the correct result in the test. The study, however, ultimately determined that
blind proficiency testing would be very difficult to implement on a large scale.
       Myers explained that the DOJ was audited by the American Society of Crime
Laboratory Directors Laboratory Accreditation Board (ASCLD/LAB) and also by the
DNA Advisory Board Standards (also known as the FBI Standards) because the lab
received federal funding as part of the database program. ASCLD/LAB accredited labs
throughout the world, and its accreditation meant the lab was following its minimum
standards in areas such as quality assurance, work validation, and training of personnel.
*      See footnote, ante, page 1.



                                            74.
Myers explained that the DOJ lab had successfully passed the audits by both boards. The
lab had been accredited since 1993.
       On cross-examination, Myers agreed that accreditation does not guarantee good
scientific work. But the ASCLD/LAB auditors thoroughly examined five cases from
each analyst at the lab. Myers believed the auditors may have examined his work in this
case the last time the lab was audited. According to an audit report, auditors examined
50 forensic profiles that the lab had uploaded to the national index and found that two
profiles were inappropriate. One was incomplete and one was inaccurate. Myers agreed
that the accreditation process did not prevent instances of sample switching,
contamination, or sloppy handling.
                      k.     Quality Control*
       The DOJ lab‟s quality control included the use of various controls for the PCR
process and for contamination. The DOJ‟s facility, protocols, and actual casework were
reviewed and inspected by internal committees and by state and federal accreditation and
reviewing agencies. Every time an analyst at the lab completed a case, the work
underwent a highly detailed technical review. If the reviewer agreed with the analyst‟s
results, the case was then administratively reviewed for proper documentation.
       On cross-examination, Myers testified that the lab had a quality control
department that was responsible for checking the reagents and the kits used in the STR
protocol. Myers explained that it was his practice to clean and decontaminate his lab
bench counters by wiping them with water, alcohol, and a bleach solution. He never
placed evidence directly on the counters; he always used a clean paper surface. Myers
stated that the controls run in this case tested as expected.




*      See footnote, ante, page 1.



                                              75.
                     l.     Contamination*
       Myers noted that flexibility is required in the interpretation of samples that might
have been exposed to unknown environmental conditions. Freshly drawn clinical
samples do not require the same considerations. The packaging of the 1989 vaginal swab
showed no indication that it was one of the swabs sent to the FBI, which Myers thought
was an indication that fewer people had handled it. He noted that vaginal swabs, by their
nature, are more difficult to contaminate than other types of samples.
       On cross-examination, Myers explained that instances of contamination connected
to a particular analyst at a particular moment had no bearing on other analyses in the lab.
If, however, the contamination was of a reagent used by more than one analyst, the
contamination could affect several cases. The lab‟s quality control department was
supposed to catch these instances of contamination. Myers believed the lab had never
experienced an outbreak of widespread contamination.
       Defense counsel presented Myers with several reports of contamination at the DOJ
lab, none of which involved any of Myers‟s own work. Two reports in September 2004
involved switched samples, not contamination. Others involved contamination from
another sample or from the analyst herself. In each report, it appeared that only the
particular case had been affected by the contamination.
       On redirect examination, Myers reiterated that none of these contamination reports
appeared to involve an outbreak of widespread contamination. Myers was not the analyst
in any of those cases. He explained that the controls in each analysis and the lab‟s quality
assurance program led to the capture of these instances of contamination and in the
resulting reports being produced. The program had done what it was intended to do.




*      See footnote, ante, page 1.



                                            76.
              2.      George Frank Sensabaugh, Jr.’s Testimony
                      a.     Introduction
       George Sensabaugh was a professor of Biomedical, Environmental, and Forensic
Sciences at University of California at Berkeley. He taught various courses involving
DNA technology and had published many papers. He had been on the editorial board of
the Journal of Forensic Sciences for many years, had served on both National Research
Council committees, NRCI and NRCII, and had testified as an expert in approximately
50 cases.36
       Sensabaugh believed the DOJ lab‟s STR protocols were “very sound” and
generally accepted as reliable. The protocols complied with correct scientific procedure.
He reviewed Myers‟s bench notes in this case and believed Myers‟s work was “done in a
very sound way.” He called it “[g]ood solid science.” He said the method Myers used
would yield scientifically reliable results.
                      b.     Sperm*
       Sensabaugh explained that Myers‟s notes stated he observed an average of about
60 sperm per 400x microscopic field with 50 fields. According to Sensabaugh, this was a
“pretty good amount of sperm.” He explained that this high amount of sperm was not
consistent with contamination: “It would be hard to conceive a contamination situation
in which that number of sperm would be detected. If one is detecting those, that number
of sperm on a swab[,] one would pretty much have to think that the swab [was] either
immersed in a dilution of semen or a wet swab was wiped over a semen stain. Something
of that sort.” He considered “an inadvertent transfer to be very unlikely given those
sperm, that number of sperm.”

36    Sensabaugh testified in this case as an expert in forensic DNA technology and
molecular biology.
*      See footnote, ante, page 1.



                                               77.
                     c.     Vaginal Swab*
       On cross-examination, Sensabaugh outlined the correct scientific procedure for
determining whether semen is present on a vaginal swab. First, a portion of the swab is
extracted in saline or TRIS buffered solution. A small portion of that solution is put on a
slide and stained with “Christmas tree” stain, which stains sperm heads and tails different
colors. The sperm are then examined under a microscope and counted per microscopic
field. The extent of bacterial contamination and the presence of epithelial cells (usually
vaginal) can be observed. If no sperm are observed, an acid phosphatase or P30 test can
be performed to determine the presence of semen. A negative P30 test indicates either
that no semen is present or that the threshold is below the level of detection.
       Sensabaugh reviewed Frausto-Heredia‟s June 20, 1989 letter to the FBI lab. In it,
she stated she was submitting three of the four vaginal swabs to the FBI. She stated she
had tested the fourth one with the following results: “(+) Acid Phosphatase, (-) P30
Rocket, NR on Enzyme Analysis, did detect foreign antigen[.]” Sensabaugh explained
that the positive acid phosphatase result indicated the presence of an enzyme that is found
at very high levels in semen. Sensabaugh did not know what threshold Frausto-Heredia
used, but he assumed she diluted the semen in the range of one in 100 to one in 1,000.
Sensabaugh explained that the rocket electrophoresis method is one of the less sensitive
and more problematic P30 tests, and it is possible that semen was present below the test‟s
level of detectibility. He assumed the “NR” meant no result on the enzyme assay, and he
assumed the test was PGM typing. If the semen sample had been diluted, or if a
substantial amount of the semen was no longer present in the vagina, PGM typing would
be problematic. Further, PGM degrades in the vaginal environment, and possibly an
insufficient amount was recovered from the swab. Frausto-Heredia did not identify the
foreign antigen she detected, but Sensabaugh assumed she was referring to ABO activity.
*      See footnote, ante, page 1.



                                             78.
       This information did not tell Sensabaugh very much about the quantity of semen
on the swab. Sensabaugh noted that the material on dried vaginal swabs is quite stable
for a number of years. He believed there was a moderate amount of semen on the swab,
but he explained that the number of sperm was more pertinent because it contains the
DNA. Frausto-Heredia stated she found 30 to 40 sperm on the slide, but Sensabaugh did
not know if she was relating that to a field or the entire slide. Sperm per field was the
usual way of reporting the number of sperm found. Sensabaugh noted that sperm could
survive in the vagina for up to about 72 hours.
                     d.     Amplification and Averaging*
       On cross-examination, Sensabaugh explained that the DOJ‟s protocol followed
correct scientific procedures, and the “basic protocol that was employed, the methods
used for amplification, the methods used for the analysis, the amplification products, all
of that was according to the standard protocols.”
       Sensabaugh noted that both positive and negative controls were incorporated into
the protocol. The negative controls and the reagent blank controls were indicators that
there had been no contamination, which is a concern with PCR. The positive control
indicated the procedures worked as expected. A quality assurance sample with a
preestablished profile was also included. These controls enhanced the reliability of the
testing and provided confidence in the results.
       According to Sensabaugh, Myers‟s STR analysis of both the epithelial and sperm
cell fractions used more than a sufficient quantity of DNA to perform the analysis. After
Myers‟s first amplification of the DNA, he reamplified with a few more cycles to try to
get more product to bring up weak peaks that might have been at the threshold value in
the first amplification. This was routine scientific procedure.


*      See footnote, ante, page 1.



                                             79.
       Sensabaugh also explained it was good scientific procedure for Myers to perform
replicates and average the results of those replicates, even though the lab‟s protocol did
not mention these steps. A protocol provides the basic outline and framework of the
analytical procedure, but it is not limiting. Rather, it is a baseline from which the analyst
works. A protocol should not prohibit things ordinarily done in the course of scientific
work. When an analyst encounters a situation that requires something extra to be done, it
is good science to do that extra thing. A guideline “does not constrain one from
thinking.”
       Sensabaugh explained that the electropherograms in this case demonstrated that
the sperm fraction contained more than two peaks at some of the loci, indicating the
presence of a mixture. To determine the extent of variation, Myers repeated the
amplifications and injections, and averaged the results. The lab‟s protocol did not require
this, but it was good science to try to get the clearest and most reproducible answer on the
composition of mixtures. Sensabaugh had seen other analysts average results.
       Sensabaugh explained that averaging takes into account experimental variation
that always occurs, providing a more accurate estimate of the true value than any single
measurement. Thus, when multiple measurements have been made, the better technique
is to determine both the average and the variance to get the best estimate of the true value
and the precision of the measurements. If the variance is very large, the average of the
measurements is not very accurate and there may be a problem with the measurements,
whereas consistent results across multiple replications give the analyst confidence that
the result is sound. Looking at each independent analysis separately does not provide the
same level of confidence that the results are consistent.
       Sensabaugh reviewed each of Myers‟s eight runs independently to assess whether
any different result would be obtained with any one of the runs, and he determined that
the eight individual runs gave essentially the same results as the average of those runs,



                                             80.
but averaging provided the best assessment of the true value. Averaging was the
appropriate thing to do.
       Responding to defense counsel‟s repeated suggestions that Sensabaugh‟s research
experience had no application to forensic science, Sensabaugh explained: “The contexts
[of a research laboratory and a forensic laboratory] are different but the doing of good
science is not different between the two. If one … wants to get the best estimate of a
measurement then the best way to approach it, and this is very standard scientific
protocol, as well as forensic protocol, is to make multiple determinations and then to
average the values across those determinations.”
       Sensabaugh explained the two-fold significance of Myers‟s having tested the
vaginal swab a month before the reference samples. First, defendant‟s reference sample
could not possibly have contaminated the evidence sample (vaginal swab). Second,
Myers had no prior knowledge of the reference types and could not have been influenced
by a subjective assessment of trying to fit the data to the reference samples.
                     e.     Mixture Interpretation*
       Sensabaugh reviewed Myers‟s mixture interpretation notes and concluded that
Myers relied on sound scientific principles and “took a sound approach” to interpreting
the mixture. The minor peaks in the mixture tracked with the epithelial cell type that was
presumed to originate from the female in the case. There was some overlap in alleles
between the epithelial cell fraction and the sperm cell fraction, which is not uncommon in
sexual assault evidence, and Myers‟s approach was an effort to make certain that the
mixture was properly interpreted. In his statistical calculations, Myers used the basic
formulas recommended by the NRCII report, incorporating the correction for population
structure. These formulas were generally accepted. Overall, looking at Myers‟s bench


*      See footnote, ante, page 1.



                                            81.
work and statistical calculations in this case, Sensabaugh believed Myers followed proper
procedures and obtained scientifically sound results.
       On cross-examination, Sensabaugh stated that the results were entirely
interpretable as a mixture of two contributors, one of which was the female from whom
the sample was collected. This conclusion was based on a comparison with the epithelial
cell fraction, which yielded a genetic profile that was seen at a low concentration in the
sperm cell fraction. Sensabaugh examined the peak heights at each loci and determined
that Myers‟s opinions of major and minor contributors were justified. Sensabaugh
explained that Myers entered the data, then used software to apply the NRCII formulas
and perform the calculations for the frequency of the profile in three major ethnic
populations. Sensabaugh verified that the algorithm used by the lab was the correct
computational format.
                     f.     Same Length but Different Sequence Alleles
       Sensabaugh stated that he believed sequencing of STR alleles was rarely, if ever,
done. The probability that two genetically different people would match at 13 STR loci
is almost infinitesimal. And sequencing is not an efficient method. The payoff is much
greater by testing additional STR loci.
       On cross-examination, Sensabaugh explained that it was well known in the field of
human genetics that, among people, some STR alleles contain different sequences even
though they are the same length. Sensabaugh was aware that several alleles used in STR
analysis had been found to show this sequence variation. STR analysis, however, is
based only on allele length, not sequence. The concept of sequence variation had been
studied for a long time, beginning in the days of RFLP testing, which also compared
DNA fragments by length rather than sequence. Sensabaugh agreed that if two samples
have different sequences at the same locus, then the DNA samples come from two
different people. And he agreed that if even one of defendant‟s alleles was found to be a



                                            82.
different sequence than the perpetrator‟s matching allele, then defendant would be
excluded as the perpetrator.37
       According to Sensabaugh, it was nevertheless correct scientific procedure to
compare alleles by length without taking into account possible sequence differences
“because the statistic that one is using to assess frequency of occurrence is based solely
upon the length. And any sequence variants that may be included within an allele of a
particular length are all included within that particular statistic.” But again he agreed that
if sequencing revealed that defendant possessed a variant allele, he would be excluded as
a source of the sperm sample.
       Sensabaugh explained that STR analysis is more efficient than sequencing for
identifying a person to the exclusion of all others. The objective of STR analysis is to
test a large number of loci (13 at that time) such that the frequency of occurrence of the
profile is infinitesimally small. And while sequencing might occasionally exclude
someone, “the chances are that if a person is different that way [in sequence,] they will
also be different [in length] at one of the STR loci.” Furthermore, based on the rate for
single nucleotide mutations (the substitution of one base for another), most sequence
variants are relatively uncommon.
                     g.      Error Rate*
       Sensabaugh explained that both he and the NRCII report concluded that a lab error
rate should be considered separately from the genotype frequency. Sensabaugh endorsed
the notion of introducing evidence of an industry-wide lab error rate at trial and then
allowing the particular lab to explain why the error rate does not apply to that lab. A lot

37     Sensabaugh noted that only the STR portions, not the entire genome, would need
to be sequenced. Current science was capable of doing this. DNA sequencing was done
on a daily basis by scientists all over the world. In fact, entire genomes had been
sequenced.
*      See footnote, ante, page 1.



                                             83.
of scientists in the field preferred not to introduce error rates at all. Sensabaugh believed
that labs with errors in their proficiency testing should be required to explain what they
have done to correct their problems. He believed it was fair to ask an analyst if he had
ever made a proficiency error. Accredited labs were required to keep records of their
analysts‟ proficiency records.
       On cross-examination, Sensabaugh stated the consensus was that an error rate
should be introduced on a case-by-case basis because there was no meaningful way to
attach an error rate to any single statistical estimate of genotype frequency. If an
industry-wide error rate exists, that is probative and should be introduced. And if a lab
takes precautions against foreseeable errors, that should also be introduced. A lab should
be allowed to present evidence of its own proficiency work and precautions against error.
Consistency across multiple determinations reduces the chance that a single
determination was made in error. Sensabaugh believed an error rate above one or
two percent was unacceptable, and any lab contributing disproportionately to the overall
lab error rate should go offline to correct its problems. Sensabaugh explained that in
evaluating any evidence, the chance that a mistake or error was made must be assessed.
Sensabaugh agreed that an analyst could discuss his individual proficiency testing results
as some indication of his individual error rate. When defense counsel asked if this would
create the implication that a finite number of proficiency tests accurately estimates an
error rate, Sensabaugh answered:

               “Well, that‟s the problem with presenting error rates in general.
       [T]here are a number of problems with how you define it. An industry
       standard error rate based upon proficiency trials. Proficiency trials are truly
       artificial situations. One should not make mistakes on them, obviously,
       because they are artificial situations. [¶] … [¶] It would take a very large
       number of proficiency tests [to compute an analyst‟s error rate], but the
       other part of it is that every case has it[s] unique features. And so how do
       you assess an error rate when you have an old vaginal swab compared to a
       fresh vaginal swab? How do you compare an error rate when you have an
       old blood stain compared to a fresh blood stain? How do you compare the


                                             84.
       error rate when you have a blood stain that is on a windowsill as opposed to
       one that is on a rug? All of these circumstances … are encountered in
       ordinary forensic practice. And it would be very difficult to provide—to
       replicate all of them as part of a proficiency trial.”
Sensabaugh believed an analyst should go no further than to say that he or she had taken
a certain number of proficiency tests and thus far had made no errors. This would not
translate into an error rate of zero. Sensabaugh believed the better line of questioning
would be to look at the particular elements of a case and question at what point error was
possible.
       Sensabaugh explained that after the 1996 NRCII report, error rates were no longer
a major issue in the field at large, but some people continued to raise questions about
them. The difficulty of conducting blind proficiency trials had been demonstrated.
Whenever they were attempted, the labs would recognize them. Because broader
proficiency testing programs were well-established and the results available, the need for
incorporating error rates into the statistic had diminished. Some people thought NRCII
was wrong, but Sensabaugh felt those people mistakenly believed proficiency testing
could be incorporated into a forensic lab in a production-line basis, as it is in a clinical
lab. In fact, that sort of redundancy is built into a forensic case.
                      h.     Statistics*
       On cross-examination, Sensabaugh explained that a considerable dispute arose
after the 1992 NRCI report regarding the way the report dealt with population genetics
and statistical issues. In 1994, Eric Lander from the NRCI committee and Bruce
Budowle of the FBI wrote a letter, published in the journal Nature, stating that they
believed the main population and statistical issues had been resolved, even if some
peripheral issues remained. A number of prominent people responded to the letter,



*      See footnote, ante, page 1.



                                              85.
stating that the population figures were not good and that accurate estimates of lab error
rates were needed.
       On direct examination, Sensabaugh stated that the letters were written in 1994,
before the 1996 NRCII report. The 12-person NRCII committee, of which Sensabaugh
was a member, considered the same issues raised by the letters. In fact, these issues were
part of the reason the NRCII committee was created. The committee concluded that the
error rate should be a separate consideration from the population statistic.
       As for controversy over whether hidden levels of population structure might
distort statistics, by the time NRCII was deliberating, there was a considerably larger
body of population data suggesting that there was no significant distortion and that
correction would compensate for the distortion that did exist.
              3.     Delia Frausto-Heredia’s Testimony—for the Defense*
       In June 1989, Delia Frausto-Heredia was employed by the California DOJ crime
lab in Fresno. She worked on this case with Gary Cortner and a third analyst. When she
received the case, Cortner had already made slides from the vaginal swabs and found
sperm on the slides. Cortner‟s notes stated that he observed about 20 to 25 sperm (some
were just heads) on a slide. Two photographs attached to the same page of Cortner‟s
notes showed a single intact sperm on each. Frausto-Heredia explained that the
photographs did not show everything Cortner observed; they were simply to illustrate
what he found.
       Frausto-Heredia‟s task was to examine the vaginal and penile swabs and
defendant‟s underwear for the presence of semen. She examined the swabs and
underwear at different times, as was her practice to avoid contamination. The vaginal
swabs and clothing were stored in different locations—the vaginal swabs in the
refrigerator portion of the evidence vault and the clothing in the freezer.
*      See footnote, ante, page 1.



                                             86.
         On June 12, Frausto-Heredia examined the vaginal and penile swabs. First, she
removed the victim sexual assault kit from the refrigerator portion of the evidence vault.
The four vaginal swabs were together in one envelope. She tested one swab for acid
phosphatase and got a positive result. She explained that acid phosphatase is present in
high levels in seminal fluid and in low levels in other body fluids, such as vaginal
secretions. A positive acid phosphatase test is presumptive for semen. Frausto-Heredia
also tested the swab for the presence of the P30 protein, also presumptive for semen, but
got a negative result. Frausto-Heredia also tested the swab for PGM, another highly
unstable protein found in seminal fluid. She was not surprised to get no results. She
explained that these three unstable proteins degrade quickly. They begin degrading
immediately inside a deceased victim, and they degrade quickly when the sample is not
stored properly, such as when the sample is not air dried or not stored in a paper bag.
Sperm cells, by contrast, are extremely stable.
         Frausto-Heredia could not estimate the number of sperm that would be collected
12 hours after ejaculation. She explained there were too many variables, including how
much of the sample was collected. For example, nurses tended to collect more of the
sample pooled in the cervix, whereas coroners tended to collect less by swabbing the
vagina. In a deceased victim, the seminal fluid immediately begins to degrade, whereas
the sperm does not degrade quickly. In her cases, Frausto-Heredia had observed between
zero and hundreds of sperm per slide.
         After Frausto-Heredia examined the vaginal swabs, she returned them to the
victim sexual assault kit and placed the kit back in the refrigerator portion of the evidence
vault.
         At this point, Frausto-Heredia replaced the paper cover on her work surface. Then
she removed the suspect sexual assault kit from the refrigerator portion of the evidence
vault and tested defendant‟s penile swab for acid phosphatase. The result was negative.



                                             87.
       A week later, on June 19, Frausto-Heredia examined defendant‟s underwear. The
only test she performed on defendant‟s underwear was the acid phosphatase test, which
was negative. Nothing suggested that seminal fluid was present on the underwear. She
found some stains that fluoresced under the laser, but they may have been urine. Frausto-
Heredia was quite certain there was no seminal fluid on defendant‟s clothing. The penile
swab was also negative for acid phosphatase. Frausto-Heredia explained that based on
the time period and the manner in which the items were preserved, she would have
expected a positive acid phosphatase result if seminal fluid were present, as it was on the
vaginal swabs.
       After Frausto-Heredia examined the vaginal swabs, she gave them to O‟Clair.
O‟Clair did not take possession of defendant‟s penile swab or underwear.
       On cross-examination, Frausto-Heredia again explained that the photographs of
sperm on a slide in Cortner‟s notes showed only a portion of a slide. The photographs
were merely representative of what was on the slides.
       The results Frausto-Heredia obtained on the acid phosphatase, P30, and PGM tests
were not inconsistent with the presence of sperm on the slide because these three
components are all very unstable compared to sperm. Frausto-Heredia had worked on
many cases where she had gotten no results on these three tests, then years later found
sperm that yielded DNA for profiling.
              4.     Trial Court’s Ruling*
       The parties submitted on the written briefs, and the trial court ruled as follows:

              “The Court finds that the evidence presented at the hearing through
       the two witnesses that were presented by the Prosecution[,] taking into
       consideration the testimony provided by the witness for the Defense, are
       sufficient that the evidence established that the PCR/STR DNA testing was
       done in this case in a proper fashion. It was performed by a qualified

*      See footnote, ante, page 1.



                                             88.
expert and it was … a sound application, a correct application of scientific
procedures and it‟s generally accepted in the scientific community. And it
resulted in correct scientific results.

       “I find in a majority of the—and that deals with like basically the
other first prongs, and the second prong, and the third prong as set forth in
Brown[, supra, 91 Cal.App.4th 623] and Venegas[, supra, 18 Cal.4th 47].
And I find that the evidence should be permitted to go to the jury.

       “The correct scientific procedures were used in this particular case.
There [are] some certain questions about whether or not there is some sort
of contamination. There [are] some questions about handling of the
documents. But as I indicated earlier in my prior rulings, that those go to
the weight of the evidence, not to its admissibility.

       “You know, in doing—I realize this is a case where we have to do a
case specific inquiry. In all of the evidence that we had that was presented
by the Prosecution with really no defense evidence to the contrary other
than the evidence that you could arguably say is contrary and the materials
that were exhibits. Those, again, didn‟t convince me that there was
anything that was improperly done. And that the correct scientific
procedures were not used.…

        “And so, I could try and address some of these other things, you
know, as to the thing and I‟m thinking it probably might be a good idea to
do that. I think we‟ve already addressed the contamination issue. The lack
of a blind proficiency testing. You know, I don‟t think that‟s, you know,
that much of an issue, because the lab has undergone and passed
proficiency testing.

        “And a failure to provide sequenc[ing]. Again, there‟s no evidence
of failure to provide the sequenc[ing] is not generally accepted in the
community. The failure to apply the FBI protocols and all. And again, in
relationship to that, while not all the FBI protocols may have been followed
in regards to the matter, the lab has still been certified and accredited by the
ASCLD as having scientifically accepted … protocols and procedures. So
that‟s sufficiently been done.

        “The big issue on the … population data base is basically the basis
of this case being reversed on its last occasion. And argued again by the
Defense here, the fact of, you know, that they say that the population data
base science tests were inadequate. You know, they were adequate. The
same data base that‟s being questioned in this case has been accepted in the
case of People vs. Wilson[, supra, 38 Cal.4th 1237] even though it excludes


                                      89.
       one data base in relationship to the Asians. So I think that issue has pretty
       much [been] taken care of.

              “You know, in this case, you know, Mr. Myers did follow the
       appropriate, you know, testing procedure as set forth in the Profiler Plus
       and the Cofile[r] PCR and STR kits. Those were used and they were, and
       those kits have been found acceptable in the general, you know, scientific
       community and there‟s case law of People vs. Henderson[, supra, 107
       Cal.App.4th 769] that addresses that. And the witness—even
       Dr. Sensabaugh said the averaging of the multiple runs was good [science]
       and procedures that were used were consistent with that protocol.

               “We‟ve already addressed the chain of custody issues as well. So
       the Court‟s going to allow the DNA testing. Of course you‟re going to be
       able to attack that by your own witnesses, you know, as to whether or not it
       is sufficient. But it doesn‟t go to its admissibility. Again, that all goes to
       its weight.

              “So that takes care of that.…”
              5.     Defendant’s Contentions
                     a.     Blind Proficiency Testing*
       Defendant first argues that although the DOJ lab was accredited, it failed to
conduct the blind proficiency testing required by generally accepted scientific
procedures. Defendant states that the 1992 NRCI report “explicitly makes blind
proficiency testing a necessary prerequisite to admission.”38
       The People respond that the more recent 1996 NRCII report demonstrates that the
NRC does not require blind proficiency testing.
       Defendant replies: “NRC has specifically noted that blind proficiency testing is
entirely different and indeed, „provides a truer test of functional proficiency because the

*      See footnote, ante, page 1.
38     Defendant quotes this portion of NRCI: “[C]ourts should require that a proponent
of DNA typing evidence have appropriate accreditation—including demonstration of
external, blind proficiency testing (as well as other accreditation that might be mandated
by government or come to be generally accepted in the profession)—for its evidence to
be admissible.” (NRCI, supra, at pp. 106-107.)



                                            90.
analysts will not take extra care in analyzing samples.‟ ([NRCII, supra,] at p. 79.)” He
states that, despite the difficulties in administering blind tests, “NRCII nonetheless
recommends that „some of the tests should be blind.‟ ([NRCII, supra,] at p. 88.)”
       As the parties recognize, NRCII addresses not only the benefits of blind
proficiency testing, but also the practical difficulties in administering it. Defendant is
wrong that NRCII states blind proficiency testing “„provides a truer test of functional
proficiency.‟” NRCII states instead: “It has been argued that full-blind testing provides
a truer test of functional proficiency because the analysts will not take extra care in
analyzing samples. Whether or not that is so, this form of proficiency-testing evaluates a
broader aspect of laboratory operation, from the receipt of the „evidence‟ at the front desk
through analysis and interpretation to final reporting.” (NRCII, supra, at p. 79, italics
added.) As for the practical application of blind proficiency testing, NRCII
acknowledges:

       “The logistics of full-blind proficiency-tests are formidable…. The
       TWGDAM [Technical Working Group on DNA Analysis Methods]
       guidelines recommend one full-blind proficiency test per laboratory per
       year if such a program can be implemented. The DNA Identification Act of
       1994 required that the director of the National Institute of Justice (NIJ)
       report to Congress on the feasibility of establishing a full-blind proficiency-
       testing program. The NIJ has reported that, although several of the large
       laboratory systems conduct blind testing in-house, there is no blind,
       external, DNA profi[ci]ency-testing program generally available to public
       or private laboratories. The report mentioned some potentially serious
       issues with blind testing, including the cost of implementation, the risk that
       DNA data from an innocent donor to the test might end up in criminal DNA
       databanks, and the chance that the test would impose excessive costs and
       time demands on law-enforcement agencies. The NIJ has contracted a
       study to review current testing programs and to examine alternative ways of
       performing blind tests.” (NRCII, supra, at pp. 79-80.)
       Furthermore, while NRCII does recommend that some of the proficiency tests
should be blind, defendant‟s characterization of that recommendation is also misleading.
NRCII‟s recommendation states:


                                             91.
              “Regular proficiency tests, both within a laboratory and by external
       examiners, are one of the best ways of ensuring high standards. To the
       extent that it is feasible, some of the tests should be blind.

             “Recommendation 3.2: Laboratories should participate
       regularly in proficiency tests, and the results should be available for
       court proceedings.” (NRCII, supra, at p. 88, italics added.)
       We conclude that the authority cited by defendant does not support the proposition
that blind proficiency testing is required by generally accepted scientific procedures.
And, as the trial court found, there was ample evidence that the DOJ lab was fully
accredited and Myers‟s proficiency fully tested. Myers had undergone at least
20 proficiency tests for the STR procedure alone. The DOJ lab had participated in a
blind proficiency testing feasibility study in which the lab obtained the correct result, but
which led to the conclusion that blind proficiency testing would be very difficult to
implement on a large scale. Myers explained that because the DOJ lab was accredited by
ASCLD/LAB (since 1993), it was required to adhere to certain standards of quality
assurance, work validation, and personnel training.
       According to Sensabaugh, the difficulty with blind proficiency tests was that labs
always recognized them. Broader proficiency testing programs were well-established
and the results were available. He believed analysts should have to account for their
proficiency errors.
       The trial court did not abuse its discretion when it determined that a lack of blind
proficiency testing did not constitute incorrect scientific procedures.
                      b.     Deviation from Protocol without Validation*
       Defendant contends the DOJ lab deviated from ABI‟s protocol in ways that had
not been scientifically validated for reliability. Specifically, he points to the use of a
different allele call threshold and a different level of data smoothing. He concedes that


*      See footnote, ante, page 1.



                                              92.
Myers testified the DOJ had validated its deviations, but says he failed to establish
exactly how it had done so.
       At the Kelly hearing, the uncontroverted evidence established that the DOJ
validated its STR protocol according to validation guidelines, and its studies were more
extensive than what was required for internal validation. Some of its studies, including
the validation of the Profiler Plus and COfiler kits, reached the level of developmental
validation and were presented at a scientific meeting. In addition, the lab‟s validations
were externally reviewed for sufficiency as part of the lab‟s accreditation. Furthermore,
there was no evidence that the DOJ‟s allele call threshold was unreasonable or improper.
Different labs adopted different thresholds, depending on how conservative they chose to
be. As for data smoothing, the advisors at ABI personally recommended light smoothing
for analysts with advanced experience. The DOJ validated the light smoothing level.
Finally, Myers explained that none of the changes the DOJ made altered the fundamental
procedure. In sum, there was substantial evidence from which the trial court could
determine that the protocol followed by Myers was adequately validated. The court did
not abuse its discretion.
                      c.      Contamination*
       Defendant maintains that the prosecution failed to demonstrate through qualified
experts that both law enforcement and the labs in this case used generally accepted
methods for collecting, handling, and testing the vaginal swab. Defendant complains that
the DNA on the swab was collected during Amber‟s autopsy in a mortuary and allowed
to air dry. He claims that by the time the vaginal swab reached the lab in 2004, it “had
repeatedly come into contact with [defendant‟s] biological samples, and his belongings.”
He asserts that “the record affirmatively suggests that contamination had occurred.” He


*      See footnote, ante, page 1.



                                            93.
further argues that Myers‟s testimony failed to establish that he followed generally
accepted methods to avoid contamination when he tested the DNA on the vaginal swab.
       We agree with the trial court that these issues fall outside of Kelly‟s third prong.
As Venegas explained, “[s]hortcomings such as mislabeling, mixing the wrong
ingredients, or failing to follow routine precautions against contamination may well be
amenable to evaluation by jurors without the assistance of expert testimony.” (Venegas,
supra, 18 Cal.4th at p. 81.)
       Contamination is a concept readily comprehensible to jurors for their evaluation
and weighing at trial. (Venegas, supra, 18 Cal.4th at p. 81.) Thus, it is an issue going to
weight, not admissibility, and the trial court did not abuse its discretion in so concluding.
At trial, the jury was presented with ample evidence regarding the collection, handling,
and testing of the vaginal swab, defendant‟s clothing, and other items, from which the
jury could weigh the value of the resulting biological evidence.
       Moreover, we disagree with defendant that the Kelly record suggests
contamination occurred at any stage in this case. Indeed, the evidence supported the
contrary conclusion. Myers testified that the vaginal swab contained far too much sperm
to have been transferred by contamination. He explained that dried vaginal swabs are not
prone to contamination. He thought the defense‟s contamination scenario was unlikely in
any lab, even one in the 1980‟s. He also explained the procedures he followed to
eliminate or reveal contamination in the lab, on his own work bench, and in his PCR
reactions. The controls he used in this case revealed no evidence of contamination. He
explained that the reports of contamination presented by the defense were not connected
with this case, his own work, or lab-wide contamination.
       Similarly, Sensabaugh testified that the large amount of sperm on the vaginal swab
was not consistent with contamination. He could hardly imagine how contamination
could transfer that amount of sperm and he considered an inadvertent transfer very
unlikely. Sensabaugh explained that Myers could not have contaminated the vaginal

                                             94.
swab with defendant‟s reference blood sample because he examined the blood a month
after he examined the swab. And the controls Myers used in the PCR reactions
established there had been no contamination in those reactions.
       Frausto-Heredia testified that she stored and examined the swabs and underwear
separately to avoid contamination.
                     d.      Averaging*
       Defendant complains that Myers‟s averaging of the STR results was “purely of his
own invention,” not part of any written protocol for interpretation of data, and therefore
not compliant with accepted scientific procedures. All of the evidence, however,
supported the conclusion that averaging was correct scientific procedure.
       Myers explained that he performed the multiple amplifications and injections to
ensure that the imbalanced peaks in the first amplification were not due to a rare
stochastic occurrence. And, although there was no evidence of a written STR protocol
calling for this averaging, the uncontradicted evidence established that it was simply
good scientific procedure. Despite defense counsel‟s relentless attacks, Sensabaugh
repeatedly explained that the averaging of multiple measurements is such a standard
principle of scientific research and forensic protocol that it need not be written into a
basic protocol. He explained that the best estimate of a true value is obtained by
determining both the average and the variance of multiple measurements. Averaging was
the correct thing for Myers to do.
       In any event, as Sensabaugh explained, in this case the variance between
measurements was small and therefore each individual measurement would have
supported the conclusion arrived at through averaging. In other words, averaging was the
correct and appropriate method, but it did not affect the results in this case. The trial
court did not abuse its discretion.
*      See footnote, ante, page 1.



                                             95.
                     e.     Triallelic Patterns*
       Defendant contends Myers refused to consider the possibility of a triallelic
perpetrator, which would have excluded defendant as a contributor. He points to the
trialellic pattern of the 23, 25, and 26 alleles at the FGA locus. Unfortunately, defendant
cites no evidence to support his conclusion that Myers did not consider this possibility.
In fact, for record authority, defendant cites his own posthearing brief, but no evidence
from the hearing itself. Our reading of the record demonstrates instead that Myers was a
well-trained and highly experienced analyst who was capable of considering the many
facets involved in mixture interpretation, including whether a third peak most likely
reflected a minor contributor in a mixture or a triallelic anomaly.
       Myers explained it was immediately clear that the sperm fraction was in fact a
mixture. Indeed, the D21S11 locus showed four peaks in the sperm fraction. And
because (1) the DNA source was a vaginal swab, (2) the difference between the
contributors‟ peak heights was significant, and (3) the minor contributor‟s alleles
matched those in the vaginal epithelial cell fraction, he assumed the minor contributor
was Amber and he subtracted out her peaks, leaving the perpetrator‟s peaks. This
procedure was in accord with the DOJ protocol.
       For example, although the sperm fraction showed three peaks at the D3S1358
locus, Myers concluded that only two of the peaks belonged to the major contributor
because the third peak was only about 20 percent of the shorter major peak. According to
his notes, the average ratio of peak heights at that locus was 100 percent for the 14 allele,
75 percent for the 15 allele, and only 16 percent for the 16 allele. In compliance with the
DOJ protocol, Myers interpreted the much smaller peak as carryover from Amber‟s
epithelial DNA, which contained 14 and 16 alleles.


*      See footnote, ante, page 1.



                                             96.
       Similarly, at the FGA locus, Myers‟s notes state that the average ratio of the peak
heights at that locus was 100 percent for the 26 allele, 93 percent for the 25 allele, and
only 19 percent for the 23 allele. The epithelial DNA contained 23 and 26 alleles.
       We also note that the DOJ‟s written STR protocol addressed genetic anomalies,
such as triallelism, as follows:

               “Peak height ratios lower than 70% may indicate a mixture,
       especially when seen at more than one locus. However, a single-source
       sample may also exhibit peak height ratios below 70%, especially when
       peak heights are less than 200 RFU. Analysts should consider results at all
       loci when interpreting samples that exhibit peak height ratios of less than
       70%. Depending upon the sample source, the loci in question, the number
       of loci affected and the percent disparity between allele peak heights, the
       sample may need to be re-amplified and typed. All loci should be
       evaluated in making this determination.

                “The following are also considerations in interpreting sample
       profiles: [¶] The presence of more than two alleles per locus, especially at
       more than one locus, may indicate a mixture. However, some individuals
       may exhibit more than two alleles at one locus due to genetic anomalies
       (e.g., trisomy, chromosomal translocation, mosaicism, and chimerism).”
       (Italics added.)
       We see no evidence that Myers neglected or refused to consider the possibility of
triallelism in his interpretation. The trial court did not abuse its discretion.
                      f.     DNA Sequence Variations
       Defendant raises two issues regarding variations in DNA sequence, both of which
defense counsel vigorously pursued at the Kelly hearing: (1) alleles of the same length
but different sequence and (2) peak height imbalance and allelic dropout. Defendant
contends Myers‟s failure to investigate these issues constituted improper scientific
procedure.
       As the evidence in this case established, most regions of DNA are the same
between people. But mutations, such as the substitution of a single nucleotide for
another, create sequence variations (nucleotide polymorphisms) even in fairly stable


                                              97.
sequences. And, as Myers and Sensabaugh testified, a difference in sequence between
two DNA samples demonstrates that the DNA samples come from two different
people.39 The issues defendant raises here have to do with the ability of the STR system
to cope with these sequence variations.
                            1.     Introduction
       STR alleles are copied by PCR, and PCR relies on the binding of primers that have
been designed to match the nearly universal sequences in the regions flanking the STR
alleles. These flanking sequences are used as primer binding sites during PCR. With
most people‟s DNA, the primers bind properly to the primer binding sites, and then the
DNA between the primers is successfully copied. But if a person‟s DNA contains a
mutation within a primer binding site, PCR‟s ability to amplify the allele may be affected.
The fairly universal sequence is not present in the mutated primer binding site, and thus
the now-mismatched primer does not bind properly to it. This can debilitate or even
prevent amplification of the allele. Consequently, few or no copies of the allele are
made, and the resulting allele peak is either small or nonexistent (null)—the result ranges
from peak height imbalance to allelic dropout. When the allele drops out, which is the
most dramatic consequence, a heterozygous genotype falsely appears to be a homozygous
genotype at that locus because only one of the two alleles has been amplified.40


39      Our discussion is also based on the assumption that two samples from the same
person contain identical DNA, even when they originate from different cell types, such as
sperm and blood. We do recognize that there are instances in which a mutation occurs in
the DNA in one part of the body (e.g., sperm or cancerous tissue) but not in the DNA in
another part of the same body (e.g., blood), and instances of other genetic phenomena,
such as chimerism (e.g., due to the fusion of two fraternal twin zygotes into a single
zygote); however, we imagine these to be fairly rare scenarios. (We also recognize that
some mutations are heritable and might be found in family members, but we assume this
is not relevant to most forensic comparisons between a perpetrator and suspect.)
40   When null alleles are discovered, they are catalogued on the Short Tandem Repeat
DNA Internet DataBase (STRBase) maintained by the National Institute of Standards and


                                            98.
       By contrast, when a person‟s DNA contains a mutation within the repeat motif of
the STR allele itself, rather than the flanking regions, PCR‟s ability to amplify the allele
is not affected. The primers bind to their binding sites, which are unaffected by the
internal mutation, and the mutated stretch of DNA between the primers is copied,
regardless of its sequence. Because the resulting amplified alleles are analyzed by length,
not sequence, the sequence variation goes undetected by the STR procedure. The allele is
considered a match to an allele of the same length, even though its sequence is actually
different.41
                            2.      Same Length but Different Sequence Alleles
       Defendant contends that because of the known existence of sequence variants
within the STR alleles, his alleles should have been sequenced to determine if they
matched the perpetrator‟s alleles in sequence, not just in length. He rejects the
explanation that sequencing in forensic cases is impractical, and he asserts that a
convenient procedure does not amount to a correct one.
       At the Kelly hearing, both Myers and Sensabaugh explained that the STR
procedure cannot recognize a difference in sequence that might be contained within an
allele because the STR procedure measures allele length, not allele sequence. And they
both agreed that a difference in sequence would exclude defendant as the perpetrator.


Technology and available at http://www.cstl.nist.gov/strbase under Null Alleles. See also
Butler 2005, supra, at page 136.
41      When sequence variants are discovered, they are also catalogued on the STRBase
(http://www.cstl.nist.gov/strbase under Variant Allele Reports), which reports
409 variants of the 13 core STR alleles, as of May 17, 2013. See also Butler, Advanced
Topics in Forensic DNA Typing: Methodology (2011) (Butler 2011) appendix 1,
pages 549 through 603.
      For a discussion on the general topic of sequence variation, see Butler, Forensic
DNA Typing: Biology and Technology behind STR Markers (2001) (Butler 2001) at
pages 89 through 93.



                                             99.
Sequencing, however, is inefficient, has huge practical limitations, and is rarely done.
They explained that STR testing for length alone is acceptable because of the extreme
unlikelihood that a sequence variant would exist in a person whose alleles match in
length at 13 STR loci. The chance of an STR match at 13 loci is infinitesimally small,
and if a defendant‟s alleles do match in length at all 13 loci, it is highly unlikely that any
of those alleles fail to match in sequence. If a person differs in sequence, he will likely
differ in length at one or more loci. Furthermore, sequence variants are relatively
uncommon.42
       We conclude that the trial court did not abuse its discretion in finding that Myers
followed correct scientific procedure by using the STR procedure and not sequencing
defendant‟s alleles to test for sequence variants. The evidence before the trial court
established that although the STR procedure cannot discern sequence variants, its ability
to discern length variants is extensive enough that a match at 13 loci is astronomically
rare. The evidence therefore established it was extremely unlikely that defendant‟s
alleles, which matched the perpetrator‟s alleles in length at 13 STR loci (the chances of
which were infinitesimally small), would fail to match in sequence.


42      Both Myers and Sensabaugh noted that allele sequence is similarly not considered
in the statistical aspect of the STR procedure. Myers explained that statisticians rely on
the length, not the sequence, of the STR alleles when they determine the frequencies of
the alleles in the population. The resulting numbers define the frequency of people with a
particular allele length, regardless of sequence. He explained that this is a reason that
sequence variation is not a concern over the course of an entire 13-locus profile.
Likewise, Sensabaugh testified that it is correct scientific procedure to compare allele
lengths without accounting for possible sequence differences because the statistics used
to estimate the frequency of the alleles are based solely upon length and any sequence
variants are included in those statistics. This testimony explains that the STR statistical
analysis (to determine allele frequencies) accounts for the fact that the STR procedure
measures only allele length, and not sequence. But it does not address the match itself—
whether a defendant‟s alleles actually match the perpetrator‟s alleles—which is the issue
here.



                                             100.
                             3.     Allelic Dropout and Null Alleles
       Defendant also contends that Myers failed to account for the possibility of allelic
dropout and null alleles in the sperm fraction at the vWA locus where the results showed
a small 16 peak and a large 17 peak. Myers interpreted these peaks as a homozygous
17,17 genotype, which matched defendant‟s 17,17. Defendant suggests that the small
16 peak might have been the result of a peak height imbalance caused by a mutation in
the perpetrator‟s DNA that negatively affected amplification of the 16 allele, causing it to
nearly drop out. Defendant argues that Myers should have followed published protocols
to “recover” a possible null allele—such as lowering the annealing temperature or using
degenerate primers43 (which we discuss below)—to determine whether the sperm
fraction was in fact heterozygous 16,17, rather than what falsely appeared to be
homozygous 17,17 due to allelic dropout.
       The People respond that defendant‟s argument suffers from a fatal flaw because
Myers testified that using the same kit/primers on all the samples in the case eliminated
any false results. The People paraphrase: “In other words, while a particular sample may
produce a different result on a particular locus if two different kits were used to test that
locus, this same problem would not occur if the same kit were used to test all the
evidence (i.e., the vaginal swab and the reference samples) in a particular case.”44
       At the Kelly hearing, Myers testified that allelic dropout is fairly rare because the
regions flanking the STR alleles are quite consistent among people. He was not
concerned that a missed exclusion (i.e., a false match or inclusion) might occur because
use of the same kit on everyone‟s DNA within a case ensures that no false results are
produced. Myers explained that sometimes an analyst has a “good indication” that allelic

43     Defendant cites Butler 2001, supra, at pages 90 through 93.
44    The People cite Butler 2001, supra, at page 93 and Butler 2005, supra, at
page 137.



                                             101.
dropout has occurred due to peak height imbalance. In this case, there was no such
indication, and the existence of a mixture with Amber‟s DNA explained the presence of
the very imbalanced peaks in the perpetrator‟s sample.
                                      a.     The Theory
         Butler and other authors propound the theory that allelic dropout is not an issue in
criminal cases when the same primers (and PCR conditions) are used on both the
perpetrator‟s evidence sample and the defendant‟s reference sample—as long as the two
samples come from the same person. While we agree with this theory, we believe it fails
to consider and account for the possibility of an innocent defendant, as we will explain.
         We begin with some statements of this theory. Butler explains in Butler 2001, in
Butler 2005, and also in his 2009 book, Fundamentals of Forensic DNA Typing (Butler
2009):

                 “No primer set is completely immune to the phenomenon of null
         alleles. However, when identical primer sets are used to amplify evidence
         samples and suspect reference samples, full concordance is expected from
         biological materials originating from a common source. If the DNA
         templates and PCR conditions are identical between two samples from the
         same individual, then identical DNA profiles should result regardless of
         how well or poorly the PCR primers amplify the DNA template.” (Butler
         2009, supra, at p. 223, italics added; see also Butler 2005, supra, at p. 137
         & Butler 2001, supra, at p. 93.)
         Butler also explains in a recent article:

                 “Although usually rare (≈0.1%), primer-binding-site mutations can
         give rise to typing results that do not reflect the true underlying alleles
         present in a DNA sample. Most university and forensic labs conduct
         population genetic research or casework with only a single STR typing kit.
         Therefore, investigators do not typically have the opportunity to cross-
         check results with different PCR primer pairs. It is worth noting that, by
         using consistent primers within a laboratory, question and known samples
         will agree if both contain the same primer-binding-site mutation. In other
         words, false homozygotes caused by allele dropout in a heterozygote when
         a primer fails to anneal properly and extend are not a problem within a
         laboratory. It is with interlaboratory comparisons and DNA databases


                                               102.
       supplied with results from multiple laboratories using different kits where
       potential null alleles can cause artificial mismatches.” (Butler, et al.,
       Variability of New STR Loci and Kits in US Population Groups (2012)
       available at http://www.promega.com/resources/articles/profiles-in-
       dna/2012/variability-of-new-str-loci-and-kits-in-us-population-groups, as of
       May 17, 2013, italics added, fns. omitted.)
       Another source states:

       “In processing casework, samples typically are amplified using the same kit
       or primer set. Thus, any primer mismatch present in the [defendant‟s]
       reference sample would also be present in an evidence sample that
       originated from the same individual.” (Leibelt et al., Identification of a
       D8S1179 primer binding site mutation and the validation of a primer
       designed to recover null alleles (2003) 133 Forensic Science International
       220, 225, italics added.)
       Another says:

              “Null alleles are STR alleles that, possibly because of a mutation in
       the primer [binding] sequence, are not amplified by PCR. A null allele can
       cause an individual who is truly heterozygous to be wrongly recorded as
       homozygous for the allele that is amplified. Individual null alleles are
       difficult to detect, but a high prevalence of null alleles at a locus may be
       detected via excess homozygosity [citation]. See Butler [2001] for the
       approaches used to minimize this problem, which is now rare with modern
       STR typing techniques.

               “Null alleles cause no problem for DNA profile interpretation
       provided that each null allele is consistently unamplified in repeat PCR
       assays. In that case, crime-scene and defendant profiles will correctly be
       recorded as matching if the defendant is the true source of the crime-scene
       DNA. This might be expected to occur if both crime scene and defendant
       samples were profiled in the same laboratory. Otherwise, differences in
       protocol, or use of PCR kits from different manufacturers, could generate a
       null allele in one laboratory that is non-null in another lab.” (Balding,
       Weight-of-Evidence for Forensic Profiles (2005) p. 47, italics added.)
       Finally, authors David Kaye and George Sensabaugh, the latter of whom testified
in this case, state:

       “[M]utations in the region of a primer can prevent the amplification of the
       allele downstream of the primer (null alleles). [¶] … [¶] A null allele will
       not lead to a false exclusion if the two DNA samples from the same


                                           103.
       individual are amplified with the same primer system, but it could lead to
       an exclusion at one locus when searching a database of STR profiles if the
       database profile was determined with a different PCR kit than the one used
       to analyze the crime scene DNA.” (Kaye and Sensabaugh, Modern
       Scientific Evidence: The Law and Science of Expert Testimony, Scientific
       principles—How is DNA extracted and amplified? (2012) § 31:41 & fn. 2,
       italics added.)45
                                    b.     When the Defendant is Guilty
       We agree that allelic dropout does not appear to be an issue when the defendant is
in fact the perpetrator. When the defendant is guilty, the evidence sample from the
perpetrator (collected at the crime scene) and the reference sample from the defendant
(collected later from the defendant to compare to the perpetrator‟s sample) originate from
the same person and thus contain identical DNA. The two resulting profiles will be the
same because the same template DNA is amplified with the same primers under the same
conditions, and any allelic dropout that occurs due to any mutations in the template will
occur identically in the two identical samples. Thus, the profiles will match, even if
allelic dropout occurs, because the DNA in both samples is the same. Accordingly,
allelic dropout will not lead to the false exoneration of a guilty defendant.
       In a graphical representation of this scenario, we refer to both samples (the
perpetrator‟s evidentiary sample found at the crime scene and the defendant‟s reference
sample) as “perpetrator/defendant” (or “perp./def.”) to emphasize that the perpetrator and
the defendant are the same person. In this hypothetical, the genotype of the
perpetrator/defendant is 14,19*, where 19* represents an allele that will not amplify
because of a mutation in the primer binding site. The two identical DNA samples (from

45      Footnote * to this article states: “This chapter is abridged and adapted from the
Federal Judicial Center, Reference Manual on Scientific Evidence (3d ed. 2011), with
updates and commentary for 2012 provided by John Butler, Ph.D., of the National
Institute of Standards and Technology.” (Kaye and Sensabaugh, Modern Scientific
Evidence: The Law and Science of Expert Testimony, Scientific principles—How is
DNA extracted and amplified?, supra, § 31:41.)



                                            104.
the same person) both experience the same allelic dropout. And although the profiles
both falsely appear homozygous 14,14 due to the dropout, they are inaccurate in the same
way. Thus, the match is true, and the perpetrator/defendant is correctly incriminated:

                          allelic dropout
 perp./def.    14,19*                          false   14,14

                                                                               true match
                          allelic dropout
 perp./def.    14,19*                          false   14,14
       And of course if no null allele is involved, for example, where the
perpetrator/defendant is 14,19, and 19 represents a normal allele that will amplify and not
drop out, the two identical samples will experience no allelic dropout. Both profiles will
be true heterozygous 14,19 genotypes. The profiles are accurate, they match, and the
perpetrator/defendant is correctly incriminated:

                         no allelic dropout
 perp./def.    14,19                            true   14,19

                                                                               true match
                         no allelic dropout
 perp./def.    14,19                            true   14,19
       Accordingly, the theory propounded by Butler and others appears to be correct as
far as it goes, which it seems to us is only as far as a guilty defendant.
                                    c.      When the Defendant is Innocent
       But in cases where the defendant is not the perpetrator, the evidence sample from
the perpetrator and the reference sample from the defendant originate from different
people (because the defendant did not commit the crime and did not leave his DNA at the
crime scene) and thus the samples contain different DNA. One sample may contain DNA
with a mutation and the other sample may not. Allelic dropout may occur in one sample
and not the other. Under these circumstances, allelic dropout in one sample may lead to a



                                              105.
false match that falsely incriminates an innocent defendant. It is this possibility,
represented below, that addresses defendant‟s concern that the perpetrator in this case
might actually have been heterozygous, but falsely appeared homozygous due to allelic
dropout, and therefore falsely matched defendant‟s homozygous genotype.
       If, as in the first scenario, the perpetrator is 14,19*, his mutant 19* allele will not
amplify. The 19* allele drops out and his genotype falsely appears as a homozygous
14,14. But if now the defendant (who is a different person) is a true homozygous 14,14,
he will be considered a match to the perpetrator‟s false homozygous 14,14. The
defendant is included as a possible perpetrator, and he is falsely incriminated:

                       allelic dropout
  perp.    14,19*                           false    14,14

                                                                                false match
                      no allelic dropout
   def.     14,14                            true    14,14
       We have not found reference to this scenario in the literature, but it plainly
suggests that allelic dropout is not always a benign phenomenon in criminal cases
because not all defendants are guilty. Where the perpetrator and the defendant are
different people and where one of them is mutant heterozygous and the other is normal
homozygous, the dropout in the mutant heterozygous sample can cause a false
homozygosity and a false match to the homozygous sample. This means, in theory at
least, that allelic dropout is capable of leading to the conviction of innocent defendants.
If our conclusions are accurate, the widely held idea that allelic dropout cannot cause
false results in a criminal case as long as the same primers/kit are used on both the
defendant‟s and the perpetrator‟s DNA samples is a very serious falsehood based on the
improper assumption that the defendant is guilty.




                                             106.
                                   d.     “Recovery” of Null Alleles
       The scientific community has devised methods to remedy allelic dropout by
“recovering” a null allele that has dropped out due to a mutation in a person‟s primer
binding site. (Recovery also includes routine preemptive practices that prevent a null
allele from dropping out.) As Myers testified, “there are ways that people have tried to
deal with [sequence variations that affect primer binding].”
       The recovery of a null allele is based on restoring amplification despite a sequence
variation in the primer binding site, usually by one of three methods. The first method
uses a reduced annealing temperature during PCR. The reduced temperature lowers the
stringency of the hydrogen bonds, thereby promoting binding between the primer and the
mutant primer binding site, even though they do not match perfectly due to the mutation.
With this change, the primer binds to the mutated primer binding site, despite the
mismatch, and amplification will proceed.46 The second method uses degenerate
primers—a mixture of primers, one of which is specifically designed to match and bind
to the mutant sequence.47 The new primer binds to the mutated primer binding site,
because they match, and amplification will proceed.48 The third method uses an entirely


46     See, e.g., Butler 2005, supra, at pages 135 through 138; Butler 2001, supra, at
page 92; Hendrickson et al., Accurate STR Allele Designations at the FGA and vWA Loci
Despite Primer Site Polymorphisms (Mar. 2004) vol. 49, No. 2, J. Forensic Sciences, at
pages 1 through 5 (reducing annealing temperature improved amplification of alleles with
primer binding site mutations).
47     The mutant sequence must be known for a new matching primer to be produced.
48      See, e.g., Butler 2011, supra, at page 127 (“In some cases, STR kit manufacturers
have added an additional PCR primer to the assay that can hybridize properly to the
alternative allele when it exists in a sample. This has been the preferred solution for
[ABI] …. According to their publications, [ABI] has added an additional primer to
correct for single point mutations”); Butler 2009, supra, at pages 222 through 223; Butler
2005, supra, at pages 135 through 138; Butler 2001, supra, at page 92; Leibelt et al.,
Identification of a D8S1179 primer binding site mutation and the validation of a primer
designed to recover null alleles, supra, at page 220 (addition of a degenerate primer fully


                                           107.
different primer that is designed to bind to a different site on the DNA, often just inside
or outside of the mutated primer binding site. The different primer binds to the
nonmutated primer binding site, because they match, and amplification will proceed.49
In all three methods, the effect of the mutation in the primer binding site is eliminated—
amplification of the allele occurs as if the mutation did not exist and the null allele is
recovered.
       Defendant argues that in this case efforts should have been made to recover a
possible null allele in the perpetrator‟s DNA at the vWA locus to determine whether the
perpetrator was actually heterozygous at that locus, rather than homozygous like
defendant. If this had been the result, defendant would have been exonerated.
       To represent this type of recovery, we again begin with the scenario in which the
defendant is falsely incriminated because one of the perpetrator‟s alleles (the mutant 19*)
dropped out:




recovered the null allele in a sample with sequence variation); Leibelt, supra, at page 226
(ABI‟s Identifiler kit includes degenerate primers for the D8S1179 locus).
49    See, e.g., Butler 2011, supra, at page 127 (“Promega has moved their primers to
overcome allele dropout problems”); Butler 2009, supra, at pages 222 through 223.
        The use of kits made by different manufacturers and containing different
(proprietary) primer sets led to the discovery of null alleles. Now, concordance studies
are conducted with different kits to discover more null alleles. If two kits containing
different primers produce different (discordant) results from the same person‟s DNA (one
kit producing a heterozygous genotype and the other producing a homozygous genotype),
allelic dropout is suspected as the cause of the homozygous genotype. STRBase lists, for
example, eight null allele incidents discovered at the vWA locus alone, four of which
occurred using the Profiler Plus kit but not with another kit: loss of allele 19; loss of
alleles 15 and 17; loss of allele 16; and loss of alleles 17, 18, and 19
(http://www.cstl.nist.gov/strbase under Null Alleles, as of May 17, 2013); see Butler
2011, supra, at pages 126 through 127.



                                             108.
                         allelic dropout
  perp.       14,19*                          false     14,14

                                                                                    false match
                        no allelic dropout
   def.        14,14                           true     14,14
          If the perpetrator‟s mutant 19* allele is recovered, it will amplify and appear as a
peak. The perpetrator‟s heterozygosity will be exposed (although the mutant 19* will
appear to be a normal 19). The defendant, who is homozygous, no longer falsely matches
the perpetrator, and the defendant is correctly exonerated:

                   recovery of null allele
  perp.       14,19*                       false        14,19

                                                                                  true mismatch
                        no allelic dropout
   def.        14,14                           true     14,14
          Thus, in this scenario—where one party is mutant heterozygous and the other is
normal homozygous—the dropout causes a false match and the recovery reveals an
exonerating mismatch. This is the exonerating null allele recovery to which defendant
refers.
          But we assume that null allele recovery can also lead to the opposite outcome—an
incriminating false match—because the recovery itself masks a difference in sequence
that might exonerate a defendant. The very point of null allele recovery is forcing the
amplification of an allele despite a sequence variation. If recovery is performed
preemptively on two samples that are both heterozygous—but one is normal and one is
mutant—there is a risk of concealing a sequence difference that could have exonerated a
defendant. We believe the following example demonstrates this possibility.
          If, as before, the perpetrator‟s mutant 19* allele is recovered, it will amplify and
appear as a peak, and the perpetrator will be considered heterozygous 14,19. But because
now the defendant is heterozygous 14,19, he will be considered a match even though the


                                               109.
perpetrator has the mutation and the defendant does not. The preemptive null allele
recovery has concealed the fact that the perpetrator‟s 19* allele has a different sequence
than the defendant‟s 19 allele. If this difference in sequence means the two DNA
samples come from different people, then this “match” falsely incriminates an innocent
defendant:

                  recovery of null allele
  perp.      14,19*                      false      14,19

                                                                               false match
                      no allelic dropout
   def.      14,19                          true    14,19
       If instead the mutant 19* allele is not recovered, it fails to amplify and the
perpetrator appears homozygous. The allelic dropout itself, which occurred because of a
sequence variation, exonerates the defendant:

                       allelic dropout
  perp.      14,19*                        false    14,14

                                                                             true mismatch
                      no allelic dropout
   def.      14,19                          true    14,19
       Apparently, recovery of a null allele can work in a defendant‟s favor if it happens
to reveal a heterozygous genotype that exonerates him, or it can work against him if it
happens to conceal a sequence variation that could have exonerated him. And it may do
neither. In the following scenario, both allelic dropout and null allele recovery lead to the
same false match, and the sequence variation simply goes undetected. If both parties are
homozygous, but the perpetrator has a mutant 19* allele and the defendant has a normal
19 allele, allelic dropout occurs in one sample and the homozygous genotypes match
even though one person has a mutation and the other does not:




                                            110.
                      allelic dropout
  perp.    19,19*                           false      19,19

                                                                                 false match
                     no allelic dropout
   def.     19,19                           true       19,19
       If the null allele is recovered, the perpetrator is still homozygous, the mutation is
still masked, and the genotypes still falsely match:

                recovery of null allele
  perp.    19,19*                       false          19,19

                                                                                 false match
                     no allelic dropout
   def.     19,19                           true       19,19
       These various scenarios demonstrate the limitations of the STR system that result
from its inherent inability to determine allele sequence. And they raise the issue of
whether null allele recovery should be conducted in criminal cases and, if so, under what
circumstances. The prospect that null allele recovery can reveal a heterozygosity that
exonerates a defendant suggests that recovery should be attempted when an analyst
observes a homozygous genotype that raises suspicions that a second allele has dropped
out. But the risk that null allele recovery can mask a sequence variation that could have
exonerated a defendant suggests that recovery should not be a routine, preemptive
practice in criminal cases (i.e., with the routine use of reduced annealing temperatures
and/or degenerate primers). On the other hand, preemptive null allele recovery could be
viewed simply as a means of restoring the ability of the STR system to measure alleles by
length without regard for sequence. Alleles with variations in the primer binding site
would join ranks with alleles with variations inside the STR allele itself. They all would
be measured by length and all of their sequence variations would go undetected.
Presumably, the same rationale for tolerating the possibility of an allele matching in
length but not in sequence would apply to both types of variations: a sequence variation


                                            111.
is extremely unlikely to exist in a person whose alleles match in length at a certain
number of loci.
       We see the obvious value of null allele recovery in parentage and other familial
testing (e.g., to identify parents, missing children, ancestors, and the remains of victims),
which relies on the elucidation of familial relationships despite mutations that might have
occurred between generations. And we see the value of null allele recovery when
comparing DNA profiles that have been created with different primer sets (e.g., kits from
different manufacturers). But we think the value of null allele recovery within a criminal
case—where the purpose is to determine whether two DNA samples come from the same
person—is a more complicated issue. If the ultimate test of identity between two DNA
samples is the identity of their sequences, then methods that suppress or mask sequence
differences may not be appropriate in the criminal context.
       It is our hope in discussing these issues that the scientific community will
reexamine the possible effects and management of allelic dropout in criminal cases and
determine how best to safeguard the innocent while incriminating the guilty.
                                    e.     The Present Case
       In this case, Myers‟s opinion was that allelic dropout would not cause a false
result because “the person who would have that sample would still type as this same
result using this kit. So as long as everyone is typed with the same kit there wouldn‟t be
any false result because the result will be the same.” Myers did not expressly refer to the
samples coming from the same person, as Butler and the other authors do in the excerpts
above. But if Myers‟s opinion was also based on the assumption that defendant and the
perpetrator were the same person—that defendant was guilty—then it was based on an
incorrect legal theory. And, if so, the opinion did not constitute substantial evidence that
allelic dropout did not cause, or could not have caused, a false match in this case.
(Corrales v. Corrales (2011) 198 Cal.App.4th 221, 226 [“An expert‟s opinion that
assumes an incorrect legal theory cannot constitute substantial evidence”]; Exxon Corp.

                                            112.
v. Superior Court (1997) 51 Cal.App.4th 1672, 1683 [“court is not bound by an expert
opinion that is speculative or conjectural or that is based on an incorrect legal theory”];
Pacific Gas & Electric Co. v. Zuckerman (1987) 189 Cal.App.3d 1113, 1135 [“The value
of opinion evidence rests not in the conclusion reached but in the factors considered and
the reasoning employed”; “Where an expert bases his conclusion upon assumptions
which are not supported by the record, upon matters which are not reasonably relied upon
by other experts, or upon factors which are speculative, remote or conjectural, then his
conclusion has no evidentiary value”]; see also Sargon Enterprises, Inc. v. University of
Southern California (2012) 55 Cal.4th 747, 771 [“„A court may conclude that there is
simply too great an analytical gap between the data and the opinion proffered‟”].)
       Assuming, without deciding, that Myers‟s opinion was flawed and the trial court
abused its discretion in not excluding it, we consider whether it is reasonably probable
that the verdict would have been more favorable to defendant in the absence of the error.
(People v. Prieto (2003) 30 Cal.4th 226, 247 [erroneous admission of expert testimony
reviewed under Watson standard]; Venegas, supra, 18 Cal.4th at p. 93; Watson, supra, 46
Cal.2d. at p. 836.) Had the trial court excluded Myers‟s opinion, the remaining evidence
on this topic would have constituted the following: The sperm fraction
electropherograms showed single peaks at three loci—vWA, TPOX, and CSF1PO.
Myers explained that all of these single peaks were of great enough height that he saw no
reason to suspect, based on peak height, that a second allele had dropped out.50 He also
noted that although some degradation of the DNA had occurred in this case, it was not
sufficient to concern him. Furthermore, allelic dropout is a rare phenomenon, occurring
at a frequency of about 0.1 percent.51 Even without Myers‟s potentially flawed opinion,

50     The single peaks at the vWA, TPOX, and CSF1PO loci were over 8,000 RFU,
over 1,200 RFU, and over 500 RFU, respectively.
51    We note that STRBase lists the frequency of reported primer binding site
mutations causing null alleles at the STR loci. Some mutations were found to appear as


                                            113.
we believe this remaining evidence was sufficient to establish that Myers considered the
possibility of allelic dropout, looked for signs suggesting it might have occurred, and
concluded, based on his experience and observations, that it had not occurred here and
that the single peaks represented true homozygous genotypes.
       If, however, Myers did not follow correct scientific procedure in his analysis of
the possibility of allelic dropout and thus the trial court should have excluded the
evidence of the single peaks at the three loci because allelic dropout could have occurred
at those loci, we would still conclude the court‟s failure to exclude that evidence was
harmless. If the three apparently homozygous loci had not been considered because their
single peaks were inconclusive based on the possibility of allelic dropout, the remaining
loci still would have constituted a 10-loci match that still would have produced
astronomically rare statistics and still would have been extremely incriminating.
Defendant could argue he might not even have matched at those three loci if allelic
dropout had occurred at any one of them and therefore they cannot just be ignored. But it
is always true that a match might not occur at additional loci if they are tested, even if
that possibility is extremely unlikely in light of many loci already matching. The
argument, however, is speculative and does not change our conclusion.
       In summary, if Myers‟s opinion was improperly based on the assumption that
defendant was guilty, any error in admitting the opinion was nevertheless harmless.
Other evidence showed that allelic dropout had probably not occurred at the three
apparently homozygous loci. Furthermore, even if evidence of the three apparently
homozygous loci should have been excluded, a 10-loci match would have been extremely


frequently as three in 110 and some as infrequently as one in 18,314.
(http://www.cstl.nist.gov/strbase under Null Alleles, as of May 17, 2013.) The website
also lists mutation rates of each of the core STR loci as ranging from 0.01 percent to
0.28 percent. (http://www.cstl.nist.gov/strbase under Mutation Rates for Common Loci,
as of May 17, 2013.)



                                            114.
incriminating, even though less so than a 13-loci match. We conclude there is no
reasonable probability of a more favorable verdict without Myers‟s opinion and even
without the three apparently homozygous loci. Any error was harmless. (People v.
Prieto, supra, 30 Cal.4th at p. 247 Venegas, supra, 18 Cal.4th at p. 93; Watson, supra, 46
Cal.2d. at p. 836.)
III.   AGREEMENT OF FACTS COMPRISING MURDER*
       The trial court instructed the jury on two theories of first degree murder:
premeditation and felony murder. Defendant contends the trial court violated his Sixth
Amendment right to a jury trial when it permitted the jury to convict him of murder
without agreeing on the facts that comprise the offense.
       In Schad v. Arizona (1991) 501 U.S. 624, 630-645 (Schad) and Walton v. Arizona
(1990) 497 U.S. 639, 648 (Walton), overruled on another ground by Ring v. Arizona
(2002) 536 U.S. 584, 609 (Ring), the United States Supreme Court held that federal
courts would defer to states‟ definitions of the elements of offenses, and juror unanimity
was not required as to the factual theory for a conviction. The California Supreme Court
has explicitly held that “jurors need not unanimously agree on a theory of first degree
murder .…” (People v. Nakahara (2003) 30 Cal.4th 705, 712 (Nakahara).) Defendant
argues that the United States Supreme Court‟s decisions in Apprendi v. New Jersey
(2000) 530 U.S. 466 (Apprendi) and Ring have undercut the basis for Nakahara.
       In Ring, the court overruled Walton “to the extent that it allows a sentencing judge,
sitting without a jury, to find an aggravating circumstance necessary for imposition of the
death penalty.” (Ring, supra, 536 U.S. at p. 609.) However, neither Ring nor Apprendi
mentioned Schad. Furthermore, in Nakahara, the California Supreme Court rejected the
argument that Apprendi called into question former rulings that unanimity instructions
are not required when a jury is instructed on different theories of first degree murder.
*      See footnote, ante, page 1.



                                            115.
The court explained that in Apprendi, “the United States Supreme court found a
constitutional requirement that any fact that increases the maximum penalty for a crime,
other than a prior conviction, must be formally charged, submitted to the fact finder,
treated as a criminal element, and proved beyond a reasonable doubt. [Citation.] We see
nothing in Apprendi that would require a unanimous jury verdict as to the particular
theory justifying a finding of first degree murder. (See also Ring[, supra,] 536 U.S. [at
p. 610] [requiring jury finding beyond reasonable doubt as to facts essential to
punishment].)” (Nakahara, supra, 30 Cal.4th at pp. 712-713; see also People v. Quiroz
(2013) 215 Cal.App.4th 65, 73-76.) In People v. Hawthorne (2009) 46 Cal.4th 67 at
page 89, overruled on another point in People v. McKinnon (2011) 52 Cal.4th 610 at
page 637, the court reaffirmed that a unanimity instruction is not required when two
theories of first degree murder are presented.
       We are bound by Nakahara and Hawthorne (Auto Equity Sales, Inc. v. Superior
Court (1962) 57 Cal.2d 450, 455), and therefore we reject defendant‟s contention that the
jury should have been instructed on unanimity as to the theory of murder.
                                     DISPOSITION
       The judgment is reversed.


                                                                _____________________
                                                                       Kane, Acting P.J.
WE CONCUR:


 _____________________
Poochigian, J.


 _____________________
Franson, J.




                                           116.
