
117 Mich. App. 560 (1982)
324 N.W.2d 78
PEOPLE
v.
CARNER
Docket No. 48553.
Michigan Court of Appeals.
Decided July 12, 1982.
Frank J. Kelley, Attorney General, Louis J. Caruso, Solicitor General, L. Brooks Patterson, Prosecuting Attorney, Robert C. Williams, Chief Appellate Counsel, and Geoffrey H. Nichol, Assistant Prosecuting Attorney, for the people.
Lander C. McLoyd, Assistant State Appellate Defender, for defendant on appeal.
Before: BEASLEY, P.J., and M.J. KELLY and N.A. BAGULEY,[*] JJ.
N.A. BAGULEY, J.
Defendant was convicted of *565 third-degree criminal sexual conduct, MCL 750.520d; MSA 28.788(4), after a jury trial in Oakland County Circuit Court. He was sentenced to 14 to 15 years in prison and appeals as of right.
Defendant was charged with raping his 16-year-old daughter on January 6, 1978, using force or coercion. On appeal, he has raised numerous allegations of error, several of which require reversal. We first discuss those errors which mandate reversal.
I

ADMISSION OF PRIOR SEXUAL INVOLVEMENT BETWEEN DEFENDANT AND HIS DAUGHTER
Prior to trial, defense counsel moved to preclude the use of similar acts evidence by the prosecutor and asked for an offer of proof detailing the similar acts evidence which the prosecutor intended to introduce. The defense motion was denied, the trial judge stating that the bad acts testimony had much more probative value and far outweighed any "slight prejudice" which might occur to the defendant. The jury was later instructed to consider the evidence only to determine if the defendant "was acting purposefully, that is, that his acts were the result of a characteristic scheme, plan or system he had used before".
The complainant's testimony concerning similar sexual acts included allegations that defendant would first tell her he was going to have sex with her, hit or slap her if she resisted, and then have sex with her. This evidence tended to prove that any verbal demands by defendant for sexual intercourse were in fact threats and complainant could have reasonably believed that force and violence *566 would follow if she did not comply with the demands.
The use of force or coercion is an element of the charged offense. See MCL 750.520d(1)(b); MSA 28.788(4)(1)(b) and MCL 750.520b(1)(f)(ii); MSA 28.788(2)(1)(f)(ii). The prosecution, therefore, had to present evidence of force or coercion in support of the charged offense. Under MRE 404(b), similar acts evidence may be admissible for purposes other than to prove the character of a person and to show that he acted in conformity therewith. The testimony that defendant, on many occasions before the charged offense, had threatened complainant then beat and raped her tended to establish force or coercion at the time of the charged offense.
Evidence of prior acts tending to show force or coercion at the time of the charged offense may be admitted where its probative value is not outweighed by its prejudicial effect. Unfortunately, the trial judge admitted carte blanche all the prior bad sexual acts of defendant, refusing to inquire into the specific bad acts before they were disclosed to the jury. By so doing, the trial judge precluded the proper exercise of his discretion to exclude evidence which was more prejudicial than probative. By abdicating his discretion, the trial judge abused his discretion.
Although we hold that the trial court abused its discretion here, we take note that the exception to the general rule precluding use of similar acts testimony announced in People v DerMartzex, 390 Mich 410; 213 NW2d 97 (1973), would apply here. In that case, the Court found that admission of evidence of antecedent sexual acts was especially *567 justified where an inchoate offense was charged against a member of the victim's household. Otherwise, the testimony of the victim concerning the apparently isolated assault might appear incredible. The trial court utilizing that exception must still, however, exercise its discretion and exclude the proffered evidence if its probative value is outweighed by potential prejudicial effect. The exception in DerMartzex was expanded in People v Hammer, 98 Mich App 471, 475; 296 NW2d 283 (1980), to allow evidence of antecedent sexual acts between the defendant and other members of the same household as the defendant and complainant in the charged offense.
Regardless of whether the prior sexual acts testimony was admissible on the issue of force or coercion or under the rule of DerMartzex, the trial judge, upon being asked by the defense to exercise his discretion to exclude the testimony as overly prejudicial, should have determined what the actual testimony would entail before ruling that it was admissible. We find his failure to exercise his discretion to be reversible error.
II
THE PROSECUTOR'S IMPEACHMENT TACTICS
For some unknown reason, defense counsel on direct examination questioned a next-door neighbor of defendant concerning her statements to police shortly after learning of the alleged incident between the complainant and defendant. The witness stated that her first reaction upon learning of defendant's alleged behavior was to hate defendant and try to make defendant look as bad as possible when she spoke with police officers. Later, *568 she changed her attitude about defendant and indicated that what she had told the police officers was not really true. On cross-examination, the prosecutor asked the witness whether she had told officers that defendant had told her he carried a gun 24 hours a day, that he had killed four people a long time ago, that he wrote a book called "Jailhouse Blues" and that defendant had come over to her house one day with a large handgun. The witness agreed that she had told the officers all of the above except for the statement regarding defendant's coming over with a large handgun.
Defense counsel moved for a mistrial, arguing that the mention of such matters before the jury was grounds for a mistrial and reversible error and that the prosecutor's questions were outside the scope of direct examination. The motion was overruled after the prosecutor stated that defense counsel had elicited testimony from the witness that she had lied to the police, entitling the prosecutor to go into it on cross-examination. The prosecutor also asked the witness if she had told police officers that defendant had told her he was a hit man. She was also asked if she had told police officers that defendant always had money. The witness replied negatively to both questions. The witness was further asked whether she had told police officers that one of defendant's sons told her his dad would kill the family if people found out what was going on. The witness replied that she had told this to police officers but that it was not true. Defense counsel again objected.
All these "questions" posed by the prosecution were technically proper cross-examination to impeach the witness's credibility for truthfulness. See *569 People v Bouchee, 400 Mich 253, 266; 253 NW2d 626 (1977); MRE 608(b).
We have held that a witness may be questioned concerning her bias in regard to a defendant even where the questioning might introduce evidence of another possible offense against the defendant. People v Chaplin, 102 Mich App 748, 751; 302 NW2d 569 (1980), rev'd on other grounds 412 Mich 219; 313 NW2d 899 (1981).[1] The scope of cross-examination of witnesses to show bias rests in the sound discretion of the trial court and will not be deemed error absent a clear showing of abuse of discretion. Chaplin, supra.
While the prosecutor's questions here were particularly probative of the witness's credibility for truthfulness, the questions also severely prejudiced defendant. Further, the witness had already testified on direct examination that she had previously lied, making it unnecessary for the prosecutor to delve into specific allegedly untruthful statements by the witness regarding prior bad acts of defendant.
*570 This Court has generally not found error on this ground since the allowance of cross-examination on collateral matters to impeach the credibility of a witness is generally within the discretion of a trial judge in a criminal prosecution. People v Kelly, 66 Mich App 634; 239 NW2d 691 (1976). The witness's alleged lies to police were brought out on cross-examination to attack the credibility of that witness. However, upon defendant's objection that the statements were inflammatory and prejudicial, the trial judge should have exercised his discretion to exclude the statements. They were only of marginal probative value once the witness had already admitted lying, and their prejudicial effect was extreme. The trial judge abused his discretion in refusing to limit the scope of the prosecutor's cross-examination. Cf. People v McGillen #1, 392 Mich 251, 268; 220 NW2d 677 (1974) (when rebuttal testimony is so inherently inflammatory and prejudicial, the trial judge upon objection should consider whether or not any probative value is outweighed by the inherent prejudice to the defendant and, if so, exclude it from the testimony).
III
REBUTTAL TESTIMONY ON COLLATERAL MATTERS
The prosecutor presented a rebuttal witness to contradict the neighbor's testimony regarding her statements to police. The officer testified that he interviewed the neighbor. The neighbor stated that the complainant had told her she was raped several times by defendant and was warned not to tell anyone or she would be killed. Defendant's objection on hearsay grounds was overruled. The officer also testified that the neighbor told him that defendant had come to the neighbor's house one *571 night and pulled out a large handgun, that defendant told her that he was a hit man, and that defendant did not work much and always had money.
The officer's testimony regarding the neighbor's prior statement to him that complainant had said she would be killed by defendant if anyone discovered the sexual assaults was improper extrinsic evidence of a collateral matter. Since the neighbor testified on direct examination that complainant did not tell her why no one should be told about the assaults, the prosecutor was entitled to ask the neighbor on cross-examination, if not overly prejudicial, whether she told the police that the complainant had said that she would be killed by her father if anyone discovered the sexual assaults. MRE 613(b) allows extrinsic evidence of a prior inconsistent statement by a witness if that witness is afforded an opportunity to explain or deny the statement. However, the admissibility of extrinsic evidence of a prior inconsistent statement is limited by the collateral matter rule announced in People v Williams, 159 Mich 518, 521; 124 NW 555 (1910). See, also, People v Culver, 280 Mich 223; 273 NW 455 (1937), People v Spalla, 83 Mich App 661, 671; 269 NW2d 259 (1978) (dissent by Judge KELLY adopted by the Supreme Court), rev'd 408 Mich 876; 290 NW2d 729 (1980).
There is no question that the officer's testimony regarding the statements about the defendant's handgun and alleged status as a hit man were collateral matters extremely prejudicial to defendant. The officer's testimony regarding the neighbor's statement of the complainant's fear of defendant requires closer scrutiny to determine if this involved a collateral matter. In Bixby v Gallagher, *572 43 Mich App 328, 339; 204 NW2d 295 (1972), this Court adopted an Indiana Supreme Court test as to whether or not something is "collateral". If the cross-examining party would be entitled to go into the matter in its case in chief, the matter is not collateral. In the instant case, the prosecutor could not have presented the neighbor's statements to the officer regarding the complainant's statements to the neighbor in his case in chief because the complainant's statements were hearsay. Therefore, all of the officer's testimony regarding the prior inconsistent statements of the neighbor constituted improper extrinsic impeachment on collateral matters. The officer's testimony, together with the prosecutor's inflammatory questioning regarding other alleged bad acts of defendant, were highly prejudicial to defendant and should not have been admitted by the trial court. Neither the cross-examination nor the rebuttal testimony presented by the prosecutor survived either prong of the harmless error rule. See People v Lauzon, 84 Mich App 201, 205; 269 NW2d 524 (1978).
IV
DENIAL OF A FAIR TRIAL
A review of the entire trial record convinces us that defendant was deprived of a fair trial by the overzealous conduct of the prosecutor and by the trial court's failure to control the prosecutor's conduct and provide serious consideration of defendant's attempts to fairly present his case.
In addition to the errors noted above, we hereby note some further instances of prejudicial behavior by the prosecutor. Defendant was linked to the Oakland County child slayings by innuendo. The *573 complainant was questioned by the prosecutor regarding her moral opposition to abortion (complainant had an abortion allegedly as a result of the alleged sexual attack by her father). The complainant also testified concerning defendant's alleged sexual abuse of his other children. Throughout the trial, the trial court did not appear to exercise any discretion to exclude any inflammatory material, despite its pervasiveness.
V
IMPEACHMENT OF DEFENDANT BY PRIOR CONVICTION
Prior to jury selection, defense counsel had moved to bar the prosecution's use for impeachment purposes of defendant's 1971 conviction for attempted rape. Both counsel asked the judge to weigh the probative value of the conviction against the prejudicial effect of its use. The court denied the motion without comment.
On request, a trial judge must exercise his discretion in deciding whether to exclude reference to a prior conviction record. People v Jackson, 391 Mich 323; 217 NW2d 22 (1974). In order to comply with the rule in Jackson, the trial court must positively indicate and identify its exercise of discretion. People v Cherry, 393 Mich 261; 224 NW2d 286 (1974). Although counsel for both sides here argued the probative effect versus the prejudicial impact of the prior conviction, the trial court merely stated that the motion in limine was denied. The situation in the instant case is quite similar to that in People v West, 408 Mich 332; 291 NW2d 48 (1980), and, therefore, we hold that the trial court erred by not positively indicating and identifying its exercise of discretion in denying *574 the defense motion to suppress the prior conviction.
VI
REMAINING ISSUES
Defendant raises several other issues on appeal, none of which requires reversal.
Defendant contends that two witnesses who were endorsed over defense objection the morning of the first day of trial were not res gestae witnesses and testified to inadmissible hearsay statements by the complaining witness. It is true that the two witnesses, a social worker at complainant's high school and a protective services worker with the Oakland County Department of Social Services, were not res gestae witnesses and, therefore, did not have to be endorsed by the prosecutor. The social worker interviewed the complainant the afternoon prior to the day on which the alleged offense occurred and on the day following the offense. The protective services worker was present during the second meeting with the complainant. At that meeting, the complainant told the two witnesses of the rape which had allegedly occurred the night before. See People v Johnston, 76 Mich App 332, 337; 256 NW2d 782 (1977). Even though the prosecutor was not required to endorse these witnesses, no reversible error occurred because defendant has not shown prejudicial surprise which deprived him of an opportunity to meet the evidence. In ruling that the late endorsement would be permitted, the trial court made it clear that defense counsel could have any time he needed to interview the witnesses endorsed that day. Defendant does not now claim that he was *575 denied such an opportunity. Therefore, no prejudice has been shown. People v Yacks, 49 Mich App 444; 212 NW2d 249 (1973).
Defendant's claim that the testimony of the two late-endorsed witnesses concerning statements made to them by the complaining witness was inadmissible hearsay is correct. The statements made by the 16-year-old complainant the day following the alleged rape were not excited utterances. People v Sommerville, 100 Mich App 470, 488-490; 299 NW2d 387 (1980); MRE 803(2). Even though the trial court erred in admitting the hearsay statements of the two witnesses, we do not find that defendant was prejudiced. Another witness, Eileen Blanchard, testified at trial to hearsay statements of the same sort complained of in this appeal. Additionally, complainant testified regarding the people with whom she discussed the history of her sexual abuse and the rape which is the subject of this appeal. Since defendant has not raised the issue of the admissibility of such testimony by Blanchard and the complainant, and since we are reversing defendant's conviction on several other grounds, we decline to determine whether the errors which defendant has objected to on appeal were prejudicial and require reversal.
Regarding defendant's contention that his constitutional right to a speedy trial was violated, we find that the record is too sketchy to make a determination. Because of the impact on the prosecution's right to retry defendant, defendant is entitled to an evidentiary hearing at which the trial judge should consider and make a ruling on several factors which are crucial to defendant's claim that his right to a speedy trial was violated.
*576 The record establishes that defense counsel moved to dismiss for denial of defendant's speedy trial rights on May 11, 1979. Counsel claimed that defendant had continuously insisted that his case be set for trial and that the case had been set and adjourned against his wishes. Counsel specifically claimed that several defense witnesses were not interviewed or investigated and could not then be located as a result of the delay. A hearing apparently was held on the motion to dismiss on July 18, 1979, but no transcript of this hearing on the speedy trial claim has been provided to this Court. The motion to dismiss was denied without comment on August 2, 1979, after trial had already begun.
The Michigan Supreme Court in People v Collins, 388 Mich 680, 688; 202 NW2d 769 (1972), recognized as the definitive test the general rule applicable to speedy trial cases established in Barker v Wingo, 407 US 514; 92 S Ct 2182; 33 L Ed 2d 101 (1972). The test requires a balancing of four factors: length of delay, reason for delay, whether defendant asserted his right to a speedy trial and prejudice to defendant caused by the delay.
Under Michigan law, delay in excess of 18 months results in a presumption of prejudice. People v Den Uyl, 320 Mich 477; 31 NW2d 699 (1948). It is the prosecutor's duty to rebut this presumption of prejudice. People v Bennett, 84 Mich App 408; 269 NW2d 618 (1978). Defendant here was arrested January 24, 1978, and trial commenced on July 30, 1979. Therefore, absent a proper explanation by the prosecutor, prejudice to defendant is presumed. People v Bennett, supra.
*577 Even without the aid of the speedy trial hearing transcript, it is apparent that at least some of the delay was due to defendant. In March, 1979, defendant's first appointed attorney was replaced by his actual trial attorney, apparently at defendant's request. On December 14, 1978, defendant's first appointed attorney requested an adjournment for approximately two months. Beyond this, we cannot determine to what extent the 18-month delay can be attributed to defendant. Since unexplained delays are attributable to the state, People v Giles, 48 Mich App 466, 469; 210 NW2d 515 (1973), it is up to the prosecutor on remand to establish an acceptable reason for the delay and the amount of the delay which is attributable to defendant.
Defendant contends that he asserted his demand for a speedy trial in October of 1978. This claim cannot be verified by reference to the file. Therefore, defendant should be given an opportunity on remand to show that he asserted his right to a speedy trial in October of 1978, and the trial court should make a finding of fact with respect to defendant's claim. If it is established that defendant did assert his right to a speedy trial, this factor is "entitled to strong evidentiary weight in determining whether the defendant is being deprived of the right". People v Bennett, supra, 411, quoting from Barker v Wingo, supra, 531-532.
Regarding the fourth factor of prejudice to defendant, because of the 18-month delay, the prosecution must rebut the presumption of prejudice. The speedy trial guarantee protects three interests of defendant: (1) to prevent oppressive pretrial incarceration; (2) to minimize anxiety and concern of the accused; and (3) to limit the possibility that the defense will be impaired. The last of these *578 interests is the most serious. Barker v Wingo, supra; People v Grimmett, 388 Mich 590; 202 NW2d 278 (1972). Since defendant was on bail for the last 16 months before trial, it cannot be said that he suffered significant prejudice to his person due to the delay under the first two of the protected interests of the speedy trial right. However, defendant does generally claim that his defense was prejudiced by his inability to produce certain witnesses for the defense as a result of the delay.
On remand, the prosecution should be given the opportunity to rebut any specific instances of prejudice which defendant may make. The trial court should make a specific finding regarding any conflict in opposing claims by the defense and the prosecution. Once the trial court has made appropriate findings on each of the four factors, each of the factors should be balanced to determine whether defendant's right to a speedy trial was violated.
We do not believe that reversible error occurred simply on the basis that the prosecutor asked a witness whether defendant told her that he had written a book entitled "Jailhouse Blues". While this question, when considered with other prejudicial questioning by the prosecutor, has been determined to require reversal, the question alone did not severely prejudice defendant. It did not, as defendant claims, necessarily alert the jury to defendant's previous incarceration.
No error occurred in the prosecution's opening statement. The prosecutor was not disparaging the credibility of defense witnesses by stating that she would not call family members as witnesses. She stated that the family may not have known what *579 was going on between defendant and his daughter. Compare People v Erb, 48 Mich App 622, 631; 211 NW2d 51 (1973).
We also do not feel that the prosecutor improperly used prior consistent statements of the complainant to bolster her credibility. Defense counsel implied during cross-examination that the complainant was coached in her testimony by the prosecutor and that her testimony was not the same at trial as statements earlier made to the prosecutor. Therefore, the prosecutor's questioning of the complainant on rebuttal brought out evidence probative of whether the complainant had made prior inconsistent statements. It was within the trial court's discretion to allow such testimony. Stewart v People, 23 Mich 63, 74-76 (1871).
Since reversible error has been found elsewhere, we decline to consider whether error requiring reversal was committed by the prosecutor in asking the complainant about her pregnancy and subsequent abortion. The pregnancy and abortion did not show penetration as an element of the charged offense since the complainant was found to be pregnant one day after the charged offense. See People v Borowski, 330 Mich 120, 125; 47 NW2d 42 (1951). Indeed, the prosecution, in its opening statement, indicated that the complainant had probably gotten pregnant as the result of a prior rape by her father on December 3, 1977. We agree that the similar acts evidence might have been admissible under the rule of DerMartzex, supra, if the trial court had recognized and exercised its discretion in admitting evidence of such acts. However, it is a separate question whether the complainant's pregnancy and abortion should also have come in to bolster the complainant's *580 credibility regarding the testimony of other acts. If the evidence of the similar acts of defendant was properly admitted, and we have earlier held it was not, the evidence of the complainant's pregnancy and abortion was also relevant to establish that one of the prior acts had actually occurred.
The prosecutor did not impermissibly comment on defendant's silence at trial by indicating that the complainant's testimony was uncontradicted. People v Balog, 56 Mich App 624, 628; 224 NW2d 725 (1974).
The remaining error, which concerns a violation of the indeterminate sentencing act, MCL 769.8; MSA 28.1080, is moot since we are reversing defendant's conviction. However, we note that the defendant was erroneously sentenced to a term of 14 to 15 years. The trial court should have sentenced defendant to a minimum term of only two-thirds of the maximum term. People v Tanner, 387 Mich 683, 690; 199 NW2d 202 (1972).
Reversed.
BEASLEY, P.J. (concurring).
I concur in reversing and remanding for a new trial.
I do not, however, share the conclusion that the trial judge abused his discretion by the way he handled the prior similar sexual acts testimony. Defendant argues that the similar act testimony was improperly admitted. In People v Yeo,[1] this Court analyzed the admissibility of prior bad acts under MRE 404(b) and stated:
"[T]his Court imposed three standards to establish a foundation for similar acts evidence: (1) substantial evidence that defendant perpetrated the bad act, (2) *581 that the bad act be probative of defendant's motive, intent, absence of mistake or design, scheme, plan or system in committing the charged offense, and (3) that the evidence be material to a finding of guilt for the charged offense. See also People v Richard Johnson, 99 Mich App 377; 297 NW2d 672 (1980)."
Defendant's prior sexual assaults on the victim in this case were admissible. There was substantial evidence that defendant committed the other sexual assaults. The evidence was also probative of defendant's scheme, plan, or system in committing the charged offense. The prior bad acts demonstrated defendant's use of force or coercion which is a material element of criminal sexual conduct in the first and third degrees.[2] Therefore, I would find that the similar acts testimony was admissible so long as the prosecution established the proper foundation.
Neither do I share the broad brush conclusion that from the "entire trial record" defendant was deprived of a fair trial by overzealous conduct of the prosecutor and by the trial court's failure to control the prosecutor's conduct and provide serious consideration of defendant's attempts to fairly present his case. Imputation of reversible error should be specific.
I do not agree that, in ruling upon defendant's motion to suppress reference to a 1971 conviction for attempted rape for impeachment, the trial court erred by "not positively indicating and identifying its exercise of discretion" in denying the motion. In the context of the oral argument concerning defendant's motion, I would hold the trial judge exercised his discretion. Failure to embark upon a dissertation of how he reached his conclusion *582 is not evidence of failure to exercise his discretion.
However, the assistant prosecutor's cross-examination of Carol Hedglen, a neighbor who was called as a defense witness, was improper and highly prejudicial. While great latitude is given on cross-examination, the actions of the prosecutor in bringing before the jury the allegation that defendant told the witness that he had killed four people a long time ago, that he had written a book called "Jailhouse Blues", that he said he carried a gun 24 hours a day, and that he was a hit man, far exceeded the scope of matters brought out on direct examination.
Thus, by her cross-examination of this witness, the prosecutor brought before the jury inflammatory matters not relevant or material to defendant's guilt or innocence and which reached a level so as to constitute reversible error. The prosecutor called another neighbor as a rebuttal witness who testified as to collateral matters of a highly prejudicial nature.
Last, the sentence imposed by the trial court was obviously in violation of People v Tanner.[3] Since this is a concurrence, I would not see any purpose in further comment regarding other details of the majority opinion. Consequently, I would concur in reversing for the reasons indicated in this opinion.
M.J. KELLY, J. (concurring).
I concur in Judge BAGULEY'S authored opinion requiring reversal and in Judge BEASLEY'S concurring opinion on the similar acts issue.
NOTES
[*]  Circuit judge, sitting on the Court of Appeals by assignment.
[1]  While the Supreme Court reversed our holding in Chaplin, the reversal does not affect the validity of the rule that evidence of bias is generally admissible. See 412 Mich 225. The Supreme Court's primary objection was that "to demonstrate that Lindy Ellis is a prostitute is not to show that she has the character trait of untruthfulness".

Further, the Court stated:
"If the prosecutor desired to show bias, it would have been sufficient to elicit an admission from the witness that she had posted the money to secure the defendant's release on bail. Instead, however, the prosecutor chose to emphasize Miss Ellis's prostitution activities and thereby necessarily suggested to the jury that the defendant was a person of bad character because he was closely associated with a prostitute and may have been her pimp." Id.
The Court also determined:
"The evidence was not admissible under MRE 608(b) because the conduct involved was unrelated to truthfulness. Insofar as the evidence was relevant to show the bias of the witness, it should have been excluded because the danger of unfair prejudice substantially outweighed its probative value." Id., 226.
[1]  103 Mich App 418, 425-426; 302 NW2d 883 (1981).
[2]  MCL 750.520d(1)(b); MSA 28.788(4)(1)(b) and MCL 750.520b(1)(f)(ii); MSA 28.788(2)(1)(f)(ii).
[3]  387 Mich 683, 690; 199 NW2d 202 (1972).
