                 United States Court of Appeals
                            For the Eighth Circuit
                        ___________________________

                                No. 12-3573
                        ___________________________

                             United States of America

                        lllllllllllllllllllll Plaintiff - Appellee

                                           v.

                                   Kirk Gutknecht

                      lllllllllllllllllllll Defendant - Appellant
                                      ____________

                    Appeal from United States District Court
                  for the Northern District of Iowa - Ft. Dodge
                                 ____________

                             Submitted: April 10, 2013
                               Filed: July 17, 2013
                                 ____________

Before LOKEN and GRUENDER, Circuit Judges, and PHILLIPS*, District Judge.
                         ____________

LOKEN, Circuit Judge.

      A jury convicted Kirk Gutknecht of conspiring to manufacture and distribute
50 grams or more of actual methamphetamine, and possession of pseudoephedrine
with intent to manufacture a controlled substance, in violation of 21 U.S.C.


      *
      The Honorable Mary Elizabeth Phillips, United States District Judge for the
Western District of Missouri, sitting by designation.
§§ 841(a)(1), 841(b)(1)(A), 841(c)(1) and (c)(2), and 846. The district court1 granted
Gutknecht a downward variance, sentencing him to the mandatory minimum 120
months in prison. Gutknecht appeals, arguing that there was insufficient evidence to
support the convictions. We review the sufficiency of the evidence de novo,
“consider[ing] the evidence in the light most favorable to the guilty verdict [and]
granting all reasonable inferences that are supported by that evidence.” United States
v. Wells, 706 F.3d 908, 914 (8th Cir. 2013) (quotation omitted). Applying this
deferential standard of review, we affirm.

        The government presented testimony by four witnesses who had pleaded guilty
to conspiracy to manufacture and distribute methamphetamine and testified pursuant
to plea agreements. Methamphetamine user August Defoe testified that, during the
conspiracy period alleged in the indictment, 2008 through September 2011, he
provided Gutknecht a box of pseudoephedrine pills in exchange for one-half gram of
methamphetamine at least a dozen times and saw others exchange pseudoephedrine
for methamphetamine with Gutknecht. Dan Rial testified that, after obtaining
methamphetamine by “smurfing” pseudoephedrine, he learned how to cook
methamphetamine in Gutknecht’s attic. Gutknecht and others then brought boxes of
pseudoephedrine to Rial to exchange for one-half gram of methamphetamine per box.
Gutknecht brought Rial other supplies for the manufacture of methamphetamine at
least twenty times, brought Rial methamphetamine made by other cooks to compare
the quality, and was present during the manufacture of methamphetamine at least
twice. Stacy Hanson, who lived with Gutknecht for a year and was Rial’s girlfriend,
testified that Gutknecht provided supplies including pseudoephedrine to several
methamphetamine cooks, and helped Rial manufacture methamphetamine a number
of times. William Bass, Jr. testified that another cook, Clarence Brown, manufactured




      1
       The Honorable Mark W. Bennett, United States District Judge for the
Northern District of Iowa.

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methamphetamine at Gutknecht’s residence, and that Bass delivered pseudoephedrine
pills to Gutknecht’s house and picked up methamphetamine on three occasions.

       Viewed in the light most favorable to the verdict, this was ample evidence for
a reasonable jury to conclude beyond a reasonable doubt that Gutknecht was aware
of and knowingly joined a conspiracy to manufacture and distribute
methamphetamine, see United States v. Moya, 690 F.3d 944, 949 (8th Cir. 2012)
(elements of the offense), and that he possessed pseudoephedrine knowing, or having
reasonable cause to believe, it would be used to manufacture an illegal drug, see
United States v. Brown, 461 F.3d 1062, 1069 (8th Cir. 2006). Gutknecht argues the
verdict was premised on the testimony of unreliable cooperating witnesses who hoped
to reduce their own sentences. It is well established that a witnesses’s credibility is
for the jury to decide; “the jury’s credibility determinations are virtually unreviewable
on appeal.” Moya, 690 F.3d at 950; see United States v. Aldridge, 664 F.3d 705, 715
(8th Cir. 2011). If credited by the jury, the testimony of the government’s cooperating
witnesses was sufficient to convict Gutknecht of both charges.

        Gutknecht further argues that no reasonable jury could find that he was
responsible for conspiring to manufacture and distribute 50 grams or more of actual
methamphetamine because only Rial quantified his methamphetamine transactions
involving Gutknecht, and the total of those transactions was less than 50 grams. We
are not persuaded. Rial testified that his “cooks” yielded 1½ to 2½ grams of
methamphetamine from two boxes (5 grams) of pseudoephedrine pills. The
government’s final witness, Narcotics Agent Bryant Strouse, opined that Rial was not
a proficient cook because, in Strouse’s experience, two boxes of pills would cook into
3 ½ to 4 grams of methamphetamine. Strouse introduced purchase records showing
that Gutknecht purchased 192.26 grams of pure pseudoephedrine from various retail
stores from 2008 through 2011. Based on his training and experience, Strouse
testified that this quantity of pseudoephedrine could yield “well over 150 grams of
pure methamphetamine,” using the common “shake and bake” cooking method used

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by Rial. The jury could reasonably infer that Gutknecht’s pseudoephedrine purchases
were intended for the manufacture of methamphetamine because “pseudoephedrine
has limited legal uses, and . . . if you do not have a cold, a headache, or sinus problems
there are remarkably few things you can do with pseudoephedrine except make illegal
narcotics.” Brown, 461 F.3d at 1069. Moreover, Defoe, Rial, Hanson, and Bass all
testified that Gutknecht traded boxes of pseudoephedrine for methamphetamine on
numerous occasions. As in Wells, 706 F.3d at 915, we conclude the evidence was
sufficient for a reasonable jury to find that the conspiracy involved at least 50 grams
of methamphetamine despite the absence of more specific quantity evidence.

      The judgment of the district court is affirmed.
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