Police Return of Firearms Does Not Justify Acquittal: Courts May Strike Closing Arguments That Drift from Mens Rea to an Impermissible “Trust the Police” Theory

1. Introduction

United States v. Trevino (10th Cir. May 21, 2026) addresses a recurring trial-management problem: when evidence is admitted for a limited purpose (here, to argue lack of mens rea), how far may defense counsel go in closing before the argument becomes an improper request for acquittal on a non-legal basis (e.g., “the police gave it back, so you must acquit”)?

Delbert Tyler Trevino was convicted in the District of New Mexico for (1) knowingly possessing an unregistered short-barreled rifle, 26 U.S.C. § 5861(d), and (2) willfully receiving ammunition while under felony indictment, 18 U.S.C. §§ 922(n), 924(a)(1)(D). The appeal did not dispute the sufficiency of the evidence; it challenged the district court’s decision to sustain an objection during closing argument and to strike a portion of defense counsel’s summation tied to El Paso police returning Trevino’s firearms.

The key dispute on appeal was conceptual: Trevino argued he was making a legitimate mens rea argument (knowledge/willfulness), while the government and district court treated it as an unnotified affirmative defense (public authority/related theories) barred by Rule 12.3 and by the prohibition on jury-nullification arguments.

2. Summary of the Opinion

The Tenth Circuit affirmed. It agreed the district court mischaracterized the defense argument as a “public-authority defense,” because Trevino did not claim he knowingly committed illegal conduct with government authorization. But the court held the result—cutting off and striking the challenged closing remarks—was still correct.

By the time of the objection, counsel’s “if we can’t trust that, what can we trust in the United States?” rhetoric had shifted from contesting mens rea to urging acquittal because police returned the firearms—an impermissible basis inconsistent with the court’s limited admissibility rulings and with the jury’s duty to apply the law. The district court acted within its discretion to prevent misleading or legally incorrect argument and did not violate Trevino’s Sixth Amendment right to present a defense.

3. Analysis

A. Precedents Cited

  • Staples v. United States, 511 U.S. 600 (1994)
    Role in Trevino: Establishes that for National Firearms Act-type offenses the government must prove knowledge of the weapon’s characteristics that bring it within the statute. The panel used Staples to frame the rifle count’s mens rea: Trevino needed to know the barrel was under sixteen inches.
  • Bryan v. United States, 524 U.S. 184 (1998)
    Role in Trevino: Defines “willfully” in federal firearms contexts as knowledge that the conduct was unlawful, not knowledge of the specific statute. The panel used Bryan to describe what Trevino had to know when receiving ammunition while under indictment.
  • United States v. Ogilvie, 153 F.4th 1098 (10th Cir. 2025), cert. denied, 2026 WL 490576
    Role in Trevino: Background only; Trevino abandoned a constitutional challenge to 18 U.S.C. § 922(n) in light of Ogilvie.
  • United States v. Buntyn, 104 F.4th 805 (10th Cir. 2024) and United States v. Serrano, 406 F.3d 1208 (10th Cir. 2005)
    Role in Trevino: Supply the de novo standard for claims that the court violated the constitutional right to present a defense. The panel relied on these authorities to separate constitutional review from ordinary trial-discretion review.
  • United States v. Apperson, 441 F.3d 1162 (10th Cir. 2006)
    Role in Trevino: Cited twice: (1) to describe public-authority-style defenses; (2) to articulate the entrapment-by-estoppel requirement of being “affirmatively misled” about the law. Trevino is notable for what it rejects: the court refused to reframe counsel’s remarks as fitting those defenses, because Trevino never argued the requisite elements (knowing illegality + authorization, or affirmative misleading about law).
  • Norweathers v. United States, 133 F.4th 770 (7th Cir. 2025)
    Role in Trevino: Used to emphasize what “public authority” requires: acting while knowing the conduct is illegal but believing it is authorized by the government. This helped the panel explain why the district court’s label was wrong.
  • United States v. Davis, 339 F.3d 1223 (10th Cir. 2003)
    Role in Trevino: Provides the “affirm on any ground supported by the record” principle. This is pivotal: even if the district court’s reasoning (public authority) was mistaken, the Tenth Circuit affirmed because the record supported the narrower ground that counsel misstated the jury’s task and urged an improper basis for acquittal.
  • Herring v. New York, 422 U.S. 853 (1975)
    Role in Trevino: Sets the baseline: a defendant must have an opportunity to make a proper argument on the evidence and law, but courts may ensure closing does not stray from the issues or impede fairness and order. Trevino operationalizes this by holding that striking a misleading “trust the police” argument does not abridge Herring’s protected core.
  • Ramsey v. Culpepper, 738 F.2d 1092 (10th Cir. 1984)
    Role in Trevino: Supports broad trial-court discretion to supervise closing arguments, reinforcing abuse-of-discretion review.
  • United States v. Hollis, 971 F.2d 1441 (10th Cir. 1992)
    Role in Trevino: Authorizes limiting arguments that misstate the law. The panel used Hollis to justify striking counsel’s remark once it suggested an incorrect legal basis for acquittal.
  • United States v. Wilcox, 487 F.3d 1163 (8th Cir. 2007) and United States v. McKinley, 70 F.3d 1307 (D.C. Cir. 1995)
    Role in Trevino: Persuasive support for limiting closings that are irrelevant, confusing, or misleading, and for striking improper remarks.
  • United States v. Gonzalez, 596 F.3d 1228 (10th Cir. 2010)
    Role in Trevino: Provides the principle that encouraging jury nullification is improper—context for why “acquit because it’s unfair to punish him after police returned the gun” is out of bounds.
  • United States v. Jumah, 493 F.3d 868 (7th Cir. 2007)
    Role in Trevino: Cited to describe the public-authority-style defense conceptually. The panel used it to distinguish legitimate mens rea arguments from affirmative defenses requiring notice.
  • United States v. Doe, 705 F.3d 1134 (9th Cir. 2013) and Deck v. Jenkins, 814 F.3d 954 (9th Cir. 2016)
    Role in Trevino: Additional support that restricting improper closing does not violate the right to present a defense and that courts may limit misstatements of law.
  • United States v. Kirby, 161 F.4th 1208 (10th Cir. 2025)
    Role in Trevino: Defines abuse of discretion as including decisions resting on legal error, clearly erroneous factfinding, or clear errors in judgment—used to frame the appellate lens on the closing-argument ruling.
  • Neder v. United States, 527 U.S. 1 (1999) and United States v. Rivera, 900 F.2d 1462 (10th Cir. 1990)
    Role in Trevino: Harmless-error framework, noted but not applied because the panel found no error.
  • United States v. Martinez, 92 F.4th 1213 (10th Cir. 2024) and BonBeck Parker, LLC v. Travelers Indem. Co. of Am., 14 F.4th 1169 (10th Cir. 2021)
    Role in Trevino: Used to reject the government’s claim that defense counsel’s agreement to “move on” constituted waiver by abandonment. The panel treated it as acquiescence to the court’s control of the courtroom, not an intentional relinquishment of appellate rights.
  • Corp. v. S. Jersey Res. Grp., LLC, 933 F.3d 1209 (10th Cir. 2019)
    Role in Trevino: Cited for the idea that counsel’s tactical choice not to revisit permissible arguments after a ruling does not convert a proper limitation into a constitutional deprivation.

B. Legal Reasoning

  1. What the defense was allowed to do:
    The district court ultimately permitted Trevino to introduce (i) the property-release form describing the rifle as “LONG RIFLE, AMERICAN TACTICAL” and (ii) testimony that the police returned the firearms, for the limited purpose of arguing Trevino’s mental state—knowledge of barrel length (for § 5861(d)) and willfulness/knowledge of unlawfulness (for § 922(n)/§ 924(a)(1)(D)).
  2. What the defense did in closing:
    Counsel began with permissible mens rea themes (burden of proof; knowledge; willfulness), but then repeatedly emphasized that police returned the firearms and culminated in “if we can’t trust that, what can we trust in the United States?”
  3. Why the district court’s “public authority” label was incorrect but harmless to the analysis:
    The panel agreed Trevino was not asserting public authority because he did not argue he knowingly did something illegal based on governmental authorization. The government’s alternative reframing (entrapment by estoppel) also failed because Trevino did not argue he was affirmatively misled about the law. Nonetheless, under United States v. Davis, the panel could affirm on the correct ground supported by the record.
  4. The correct ground: the closing invited an impermissible basis for acquittal and misstated the jury’s duty:
    The Tenth Circuit read the “trust” argument as decoupled from knowledge/willfulness and as implying acquittal was proper because government actors (police) returned the guns—i.e., a fairness/nullification-style rationale, not a mens rea inference. That is precisely the kind of legally misleading argument trial judges may curtail under Herring v. New York, Ramsey v. Culpepper, and United States v. Hollis.
  5. No Sixth Amendment violation:
    The opinion emphasizes a boundary drawn in Herring v. New York: the Constitution protects the opportunity to make a “proper” argument on evidence and law, not the opportunity to argue matters outside the issues or to propose an incorrect legal standard. Importantly, the jury was not instructed to disregard all El Paso evidence—only the notion that police return, by itself, made Trevino’s conduct “okay” as a matter of law.

C. Impact

Although designated an “ORDER AND JUDGMENT” and “not binding precedent,” United States v. Trevino is likely to be cited for persuasive guidance in at least four ways:

  • Mens rea vs. equitable acquittal themes: Trial courts may admit “official conduct” evidence for a narrow mental-state inference but still strike closings that convert the evidence into a broad “you must acquit because the government acted inconsistently” appeal.
  • Affirmance despite mislabeling: Appellate courts can uphold trial rulings even when the trial judge used an incorrect doctrinal label (public authority), so long as the restriction was justified as preventing misleading argument or misstatement of law (Davis principle).
  • Rule 12.3 disputes may be avoided by focusing on closing-argument propriety: Even when Rule 12.3 notice issues are raised, the decisive question may be whether the closing stayed tethered to the elements actually submitted to the jury.
  • Preservation/waiver clarity: A lawyer’s agreement to “move on” after an objection is sustained is not necessarily waiver; it may simply reflect compliance with courtroom control, preserving appellate review under United States v. Martinez and BonBeck Parker, LLC v. Travelers Indem. Co. of Am..

4. Complex Concepts Simplified

  • “Knowledge” under 26 U.S.C. § 5861(d) (short-barreled rifle): The government must prove the defendant knew the feature that makes the gun specially regulated—here, a barrel under sixteen inches (as framed by Staples v. United States).
  • “Willfully” under 18 U.S.C. § 924(a)(1)(D) (ammunition receipt while indicted): The government must show the defendant knew his conduct was unlawful, not that he knew the statute number or exact wording (Bryan v. United States).
  • Public-authority defense: An affirmative defense claiming a government official authorized conduct the defendant knew was illegal. It generally requires notice under Fed. R. Crim. P. 12.3(a)(1).
  • Entrapment by estoppel: A defense that applies when an official affirmatively misleads a defendant about what the law permits, and the defendant reasonably relies on it (discussed via United States v. Apperson).
  • Jury nullification: Asking jurors to acquit despite proof of the elements, because conviction would be unfair or because the government behaved inconsistently. Courts may bar such encouragement (United States v. Gonzalez).
  • Right to present a defense vs. limits on closing: The Sixth Amendment protects argument on the evidence and law; it does not protect misleading statements of law or arguments outside the issues (Herring v. New York as applied in United States v. Buntyn).

5. Conclusion

United States v. Trevino draws a practical line for trial advocacy: evidence of official conduct (like police returning a firearm) may be argued to support a defendant’s lack of knowledge or willfulness when those are elements, but counsel may not convert that evidence into a free-standing “trust the police, therefore acquit” rationale untethered to the charged mens rea. Even where the district court mislabels the argument as an affirmative defense, the Tenth Circuit will affirm a restriction on closing where the record shows the argument misstated the law or invited an impermissible basis for acquittal, without infringing the constitutional right to present a defense.