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No. 10375319
United States Court of Appeals for the Ninth Circuit
United States v. Perez-Ayala
No. 10375319 · Decided April 9, 2025
No. 10375319·Ninth Circuit · 2025·
FlawFinder last updated this page Apr. 2, 2026
Case Details
Court
United States Court of Appeals for the Ninth Circuit
Decided
April 9, 2025
Citation
No. 10375319
Disposition
See opinion text.
Full Opinion
NOT FOR PUBLICATION FILED
UNITED STATES COURT OF APPEALS APR 9 2025
MOLLY C. DWYER, CLERK
U.S. COURT OF APPEALS
FOR THE NINTH CIRCUIT
UNITED STATES OF AMERICA, No. 23-4228
D.C. No.
Plaintiff - Appellee, 3:23-cr-00449-JLS-1
v. MEMORANDUM*
MARIA ISABEL PEREZ-AYALA,
Defendant - Appellant.
Appeal from the United States District Court
for the Southern District of California
Janis L. Sammartino, District Judge, Presiding
Submitted April 3, 2025**
Pasadena, California
Before: GILMAN***, M. SMITH, and VANDYKE, Circuit Judges.
Maria Isabel Perez-Ayala appeals her convictions on two counts of
importation of controlled substances and on two counts of possession with the
*
This disposition is not appropriate for publication and is not precedent
except as provided by Ninth Circuit Rule 36-3.
**
The panel unanimously concludes this case is suitable for decision
without oral argument. See Fed. R. App. P. 34(a)(2).
***
The Honorable Ronald Lee Gilman, United States Circuit Judge for
the Court of Appeals, 6th Circuit, sitting by designation.
intent to distribute those substances. After a jury found Perez-Ayala guilty on all
four counts, the district court sentenced her to 66 months of imprisonment for each
count, to run concurrently. Perez-Ayala timely appealed. We have jurisdiction
under 28 U.S.C. § 1291, and we affirm.
1. Because Perez-Ayala did not object to the prosecutor’s statements in
rebuttal argument or to the district court’s jury instructions, we review her present
claims on these issues under the plain-error standard. See United States v.
Alcantara-Castillo, 788 F.3d 1186, 1190 (9th Cir. 2015). “A plain error is (1) an
error (2) that is plain, (3) that affects ‘substantial rights,’ and (4) that ‘seriously
affects the fairness, integrity, or public reputation of judicial proceedings.’”
United States v. Hinkson, 585 F.3d 1247, 1268 (9th Cir. 2009) (en banc) (quoting
United States v. Hammons, 558 F.3d 1100, 1103 (9th Cir. 2009)).
2. Perez-Ayala argues on appeal that the prosecutor’s rebuttal argument
mischaracterized the prosecutor’s role in a criminal trial. In her rebuttal, the
prosecutor stated: “My job is not to convict the defendant. My job is to present
the evidence. . . . And the Government’s job isn’t to investigate and prove that the
defendant did it. . . . Because we’re all after the same thing here, the truth.”
Perez-Ayala contends that the prosecutor was “essentially stating” that the
government would prosecute only those it knows to be guilty. But this
interpretation of the prosecutor’s argument is not “clear or obvious, rather than
2 23-4228
subject to reasonable dispute.” United States v. Marcus, 560 U.S. 258, 262 (2010)
(quoting Puckett v. United States, 556 U.S. 129, 135 (2009)). And this court does
not “presume that the jury ascribed to [a prosecutor’s argument] its most damaging
meaning” when confronted with an ambiguous statement. Hein v. Sullivan, 601
F.3d 897, 916 (9th Cir. 2010).
The prosecutor also told the jury that “you and you alone decide whether or
not the defendant is guilty or not guilty.” And the district court instructed the jury
after closing arguments that “[e]ach of you must decide the case for yourself, but
you should do so only after you have considered all the evidence.”
Even if the prosecutor’s argument was improper, we “will not reverse a
conviction [] unless the prosecutor’s statements during closing argument are so
gross as probably to prejudice the defendant, and the prejudice has not been
neutralized by the trial judge.” United States v. Virgen-Mendoza, 91 F.4th 1033,
1040 (9th Cir. 2024) (cleaned up). Perez-Ayala has not shown that “it is more
probable than not” that the prosecutor’s argument “materially affected the verdict.”
See United States v. Tucker, 641 F.3d 1110, 1120 (9th Cir. 2011) (citation and
quotation marks omitted). In sum, the prosecutor’s argument did not rise to the
level of plain error.
3. Perez-Ayala also argues that the district court erred in its instructions to
the jury about the jury’s role in a criminal trial. Defense counsel argued that the
3 23-4228
jury should “restrain the Government” and “keep it from convicting innocent
citizens.” When the prosecutor objected, the court stated that “[t]he duty of the
jury is to make the determination based on the facts of this case and the law of this
case as to the guilt or not guilt of the defendant in this case.” The court then
advised the jury that “[y]ou’re not the safe-keepers between unrestrained
government and something else. You’re here to decide the facts in this case
. . . and whether or not Ms. Perez-Ayala is guilty or not guilty.”
Requiring “the Executive Branch to prove its charges to a unanimous jury
beyond a reasonable doubt” is a “check[] on governmental power.” Erlinger v.
United States, 602 U.S. 821, 832 (2024). But even if the district court misstated
the law, Perez-Ayala has not shown that the court’s instructions prejudiced her.
Any misconception concerning the jury’s role was neutralized when the court gave
the jury the proper instructions as to its duties.
4. Perez-Ayala next argues that the district court erred in its instructions to
the jury on the government’s burden of proof. Defense counsel told the jury during
closing argument that “[r]easonable doubt is such a high standard that most of us
will never have to apply it in our daily lives unless we sit as jurors in a criminal
case.” When the prosecutor objected, the court instructed the jury as follows:
[T]he burden’s always with the Government. It’s beyond a reasonable
doubt. Now, whether or not you’ll apply that in your life is a little
difficult, and I’m not really sure that’s a good statement or way of
expressing it, Counsel. So will you follow the instructions that I’ve
4 23-4228
given you, members of the jury. But the application of that standard to
a personal life is a hard one.”
Defense counsel then analogized the burden to a scale that must “tilt[] all the way
to the other side” to result in a conviction, which prompted another objection by
the prosecutor. The court responded by reading the entire model jury instruction
on reasonable doubt to the jury.
Even if the district court plainly misstated the law about how the
reasonable-doubt standard might apply to daily life, which we need not decide,
Perez-Ayala has not shown that these statements prejudiced her. Any potential
error was neutralized when the court read the correct reasonable-doubt instruction
to the jury. See United States v. Medina Castaneda, 511 F.3d 1246, 1249–50 (9th
Cir. 2008).
5. Finally, Perez-Ayala argues that the errors alleged above had a
cumulative prejudicial effect. But we assume that jurors listen to and follow the
trial court’s instructions. United States v. Wells, 879 F.3d 900, 937 (9th Cir. 2018).
The court’s repeated recitation of the model jury instructions sufficiently
neutralized the likelihood that the jury’s deliberations were materially affected by
the combination of these alleged errors. See United States v. Flores, 802 F.3d
1028, 1040 (9th Cir. 2015) (“[I]n the context of the trial as a whole, it is unlikely
that the jury was misled about the law or the facts.”).
AFFIRMED.
5 23-4228
Plain English Summary
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS APR 9 2025 MOLLY C.
Key Points
01NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS APR 9 2025 MOLLY C.
02COURT OF APPEALS FOR THE NINTH CIRCUIT UNITED STATES OF AMERICA, No.
03MEMORANDUM* MARIA ISABEL PEREZ-AYALA, Defendant - Appellant.
04Sammartino, District Judge, Presiding Submitted April 3, 2025** Pasadena, California Before: GILMAN***, M.
Frequently Asked Questions
NOT FOR PUBLICATION FILED UNITED STATES COURT OF APPEALS APR 9 2025 MOLLY C.
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This case was decided on April 9, 2025.
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