United States v. Mullins: Strict § 1867 Compliance and a Narrow Rule 410 Shield for Plea-Related Statements to Police

Introduction

United States v. Mullins (10th Cir. Jan. 16, 2026) arises from a post-McGirt v. Oklahoma jurisdictional reset. Tyler Jay Mullins, an enrolled tribal member, pleaded guilty in Oklahoma state court in 2002 to murdering Rachel Woodall. After McGirt v. Oklahoma, the state conviction was vacated for lack of jurisdiction because the crime occurred within the Chickasaw Nation Reservation (with reservation status later confirmed in state law by Bosse v. Oklahoma). The federal government then indicted Mullins for murder in Indian country and a firearm-related death count.

On appeal, Mullins challenged three district-court rulings: (1) denial of relief under the Jury Selection and Service Act (“Jury Act”), (2) denial of suppression under Federal Rule of Evidence 410 for statements directing police to the body, and (3) denial of a motion to compel discovery of communications between the government and his former counsel under Federal Rule of Criminal Procedure 16.

Summary of the Opinion

The Tenth Circuit affirmed. It held:

  • Jury Act: Mullins’s repeated challenges were procedurally barred because he did not satisfy the Act’s strict requirements—most notably the sworn-statement requirement and the timing limits keyed to the start of voir dire.
  • Rule 410: Statements to law enforcement directing officers to the body were not protected by Rule 410(a)(4) because they were not made “during plea discussions with an attorney for the prosecuting authority,” nor was there evidence officers were authorized to negotiate a plea.
  • Rule 16: Even assuming error in denying the motion to compel, any error was harmless because Mullins sought the materials for a potential ineffective-assistance claim rather than trial preparation, and the evidence of guilt was overwhelming.

Analysis

1) Jury Act: Strict Procedural Gatekeeping

Precedents Cited

  • United States v. Kamahele (standard of review for jury-composition legal conclusions).
  • United States v. Craine (clear-error standard for factual findings).
  • United States v. Stein (“Strict compliance” with Jury Act procedural requirements; affirmance permitted on procedural grounds even if the district court reached merits).
  • United States v. Contreras (failure to include a sworn statement/affidavit precludes a Jury Act claim; procedural strictness justified to avoid wasted trial resources).
  • United States v. Cooper (reinforces affidavit requirement).
  • United States v. Phillips (Jury Act motion raised partway into voir dire deemed untimely).
  • United States v. Spradley (affirm on any ground supported by the record).
  • United States v. DeFries (reading “whichever is earlier” to make voir dire a hard cutoff).
  • United States v. Rosbottom (commencement of voir dire as the statutory cutoff; remedy structure supports cutoff).
  • Test v. United States (an “essentially unqualified right to inspect jury lists” under § 1867(f)).
  • United States v. Lawson (Tenth Circuit application of Test to inspection/copying requests).

Legal Reasoning

The court treated § 1867 as a tightly drawn mechanism: it is “the exclusive means” to challenge jury selection under the Jury Act, and it conditions relief on strict procedural compliance. Two features drove the outcome:

  • Sworn statement requirement (28 U.S.C. § 1867(d)): Mullins’s pre-voir-dire and mid-trial motions were oral and lacked a sworn statement of facts. Under United States v. Contreras and United States v. Cooper, that omission precludes the claim.
  • Timing (“whichever is earlier”) (28 U.S.C. § 1867(a)): Even though Mullins filed a post-verdict motion with a sworn statement, it came after voir dire. The court read the statute’s “whichever is earlier” language, consistent with United States v. DeFries and United States v. Rosbottom, to make the start of voir dire the effective final deadline in ordinary cases. Mullins’s argument that he moved within seven days of discovery did not matter because “before voir dire” was earlier.

The panel also rejected Mullins’s attempt to invoke § 1867(f) inspection principles because he never made a § 1867(f) motion to inspect/copy jury selection records as in Test v. United States and United States v. Lawson. He sought relief under § 1867(d) without satisfying its prerequisites.

Finally, the opinion underscored remedial structure: because Mullins’s challenge concerned the petit jury, the Jury Act remedy is a stay for reselection, not dismissal—an additional reason timing is treated as critical once voir dire begins.

Impact

United States v. Mullins strengthens the Tenth Circuit’s already strict approach to Jury Act litigation: procedural defects are dispositive, and post-voir-dire attempts to “cure” with sworn materials are too late in the ordinary case. Practically, the decision instructs defense counsel to:

  • seek § 1867(f) inspection early if data is needed to frame a challenge,
  • file before voir dire begins, and
  • include the sworn statement required by § 1867(d).

In the post-McGirt v. Oklahoma environment—where retrials in federal court may occur long after the original state proceedings—the opinion signals that jury-selection challenges will not be entertained absent meticulous statutory compliance.

2) Rule 410: “Plea Discussions” Must Involve Prosecutorial Authority (or Authorized Agents)

Precedents Cited

  • United States v. Silva (de novo review of interpretations of the Federal Rules of Evidence).
  • United States v. Channon (abuse of discretion for evidentiary rulings; clear error for fact-finding).
  • United States v. Mitchell (policy roots of excluding plea-related statements as “especially damning evidence”).
  • United States v. Browning (Tenth Circuit’s key guidepost; under former Rule 11(e)(6)(D), statements to DEA agents did not fit the “attorney for the government” language absent proof of express authorization to negotiate).
  • United States v. Ruminer, United States v. Acosta-Ballardo, United States v. Medina-Estrada (Rule 11(e)(6) treated as essentially identical to Rule 410).
  • United States v. Bauzó-Santiago (strict/plain-language reading limiting protection to discussions with prosecuting attorneys).
  • United States v. Bernal (similar limitation; later abrogated on other grounds by Crawford v. Washington).
  • United States v. McCauley (broader approach covering agents authorized to negotiate pleas).
  • United States v. Lawrence (Eighth Circuit: Rule 11(e)(6)(D) extends to law enforcement with express authority from a government attorney).
  • United States v. Serna (Second Circuit: statements to agents protected where an AUSA initiated cooperation/plea discussions and authorized agents).
  • United States v. DiNapoli (noted as abrogating Serna on other grounds).
  • United States v. Merrill (referenced for the “reasonable subjective belief” concept, though not adopted/decided here).

Legal Reasoning

Rule 410(a)(4) excludes statements made “during plea discussions with an attorney for the prosecuting authority.” The panel read its own precedent (United States v. Browning) as strongly favoring a plain-language approach: statements to law enforcement are outside the rule unless the officers are acting with plea-negotiation authority attributable to the prosecutor.

Applying that framework, the court held Mullins’s directions to officers locating the body were admissible because:

  • No statement to a prosecuting attorney: Mullins’s operative statements were made to law-enforcement officers, not to Assistant District Attorney Ross (or any prosecutor).
  • No proof of authorized plea negotiations: Even under a broader “authorized agent” approach (as in United States v. Lawrence and reflected in United States v. McCauley), there was no evidence Ross authorized police to negotiate a plea or to conduct plea discussions.
  • Distinguishing United States v. Serna: In United States v. Serna, the defendant had an initial meeting with an AUSA and then spoke to agents operating under that AUSA’s authority. Here, the earlier conversation about the death penalty was between Stout (defense counsel) and Ross alone; officers were not part of it, and the record did not show prosecutorial authorization flowing to them.
  • Subjective belief did not cure the “prosecuting authority” gap: The panel declined to resolve whether a “reasonable subjective belief” test might apply in some contexts, noting that—even if it did—Mullins still did not speak to someone with authority to negotiate a plea (echoing Browning’s separation of requirements).

The court also avoided a doctrinal expansion: it declined to “import the fruit of the poisonous tree doctrine” into Rule 410 because Rule 410 did not apply to the statements in the first place (leaving undisturbed the district court’s skepticism that Rule 410 reaches derivative evidence).

Impact

The decision reinforces a limiting principle for Rule 410(a)(4) in the Tenth Circuit: defendants cannot suppress statements to police as “plea discussions” without a concrete link to prosecutorial plea authority (direct participation by a prosecutor or proof that agents were authorized to negotiate/participate in plea discussions). In cases where cooperation steps (like locating evidence or victims) occur in parallel with informal discussions, Mullins signals that defendants must build a factual record of prosecutorial authorization—not merely show the cooperation was “contemplated” by defense counsel’s communications with a prosecutor.

3) Rule 16: Discovery Denial Reviewed for Harmlessness

Precedents Cited

  • United States v. Muhtorov (discovery decisions reviewed for abuse of discretion).
  • United States v. Freeman (de novo review for interpretations of the Federal Rules of Criminal Procedure).
  • United States v. Blechman (nonconstitutional harmless error: “substantial influence”/“grave doubt”).
  • United States v. Chavez (strength of other evidence relevant to harmlessness).
  • United States v. Hodges (harmless-error analysis can apply to denied discovery).
  • United States v. Sanders (en banc; harmless-error analysis applied to denial of Rule 16(a)(1)(E) motion).
  • United States v. Owens (similar harmless-error approach).

Legal Reasoning

Mullins sought communications between the prosecution and his former counsel, asserting concern about privileged disclosures and framing the request as potentially supporting an ineffective-assistance claim. The district court denied the Rule 16 motion after in camera review, concluding the materials were not discoverable under Rule 16(a)(1)(E) and did not reveal improper disclosures.

On appeal, the panel largely resolved the issue through harmlessness. Even assuming the materials arguably “belonged” to Mullins under Rule 16(a)(1)(E)(iii), the asserted use was not tied to trial defenses, and the evidence of guilt was overwhelming. The panel also noted the district court’s order left open the possibility of seeking the documents “for another purpose,” further undermining any claim of trial prejudice.

Impact

The opinion underscores that Rule 16 disputes—especially those aimed at collateral claims rather than trial defenses—may be difficult to turn into reversals absent a concrete showing of trial prejudice. It also affirms that appellate courts may apply harmless-error review to discovery denials even when the disputed materials are not included in the appellate record, relying on precedent recognizing that discovery errors are often evaluable through prejudice analysis.

Complex Concepts Simplified

  • “Indian country” and federal jurisdiction: After McGirt v. Oklahoma, crimes by Indians in Indian country covered by the Major Crimes Act (18 U.S.C. § 1153) generally fall under federal, not state, prosecution.
  • Voir dire: The jury-selection stage where prospective jurors are questioned. Under the Jury Act (28 U.S.C. § 1867(a)), the start of voir dire is typically the critical cutoff for filing challenges.
  • Sworn statement (Jury Act): A written, sworn factual proffer required by 28 U.S.C. § 1867(d). Without it, a Jury Act challenge is procedurally barred in the Tenth Circuit.
  • In camera review: The judge privately reviews materials (not disclosed to the parties) to decide issues like privilege, discoverability, or alleged misconduct.
  • Rule 410(a)(4): Protects certain plea-discussion statements, but (as applied here) generally requires discussion with a prosecuting attorney (or an authorized agent operating with prosecutorial plea-negotiation authority).
  • Harmless error: Even if a trial court makes a mistake, an appellate court will affirm if the mistake likely did not affect the verdict (the “substantial influence”/“grave doubt” test).

Conclusion

United States v. Mullins delivers three practical lessons with precedential force in day-to-day federal criminal practice. First, Jury Act challenges live or die on strict compliance: timing and sworn factual support are mandatory, and waiting until after voir dire is generally fatal. Second, Rule 410(a)(4) does not automatically cloak cooperation with police merely because defense counsel had parallel communications with a prosecutor; absent proof of prosecutorial participation or authorized plea-negotiation authority, statements to law enforcement remain admissible. Third, Rule 16 discovery disputes will not justify reversal without a demonstrated link to trial prejudice, particularly where the record shows overwhelming evidence of guilt.