United States v. Long: Separate-Case Informant Perjury Is Not Brady-Material When the Verdict Is Strongly Corroborated

I. Introduction

In United States v. Long (5th Cir. June 23, 2026) (per curiam) (unpublished), Derrick Long appealed his methamphetamine conspiracy and distribution convictions after the Government disclosed post-trial that its confidential informant, Jerome White, had given false testimony about controlled purchases in a different federal case, United States v. Manning, No. 23-00070-01, 2024 WL 2789476 (W.D. La. May 13, 2024).

Long sought a new trial under Federal Rule of Criminal Procedure 33 and, on appeal, reframed the issue as a Brady v. Maryland, 373 U.S. 83 (1963), violation—arguing the Government failed to disclose material impeachment evidence (the “Manning evidence”).

The central issue became materiality: whether nondisclosure of White’s separate-case perjury created a reasonable probability of a different outcome in Long’s trial, particularly in light of the other corroborating evidence (task force testimony, recordings, and co-conspirator testimony).

II. Summary of the Opinion

The Fifth Circuit affirmed. Because Long raised his Brady theory for the first time on appeal, the court applied plain-error review under United States v. Rojas, 812 F.3d 382 (5th Cir. 2016) and United States v. Rounds, 749 F.3d 326 (5th Cir. 2014). The panel focused on whether there was a Brady violation at all, beginning with materiality.

The court held:

  • The Manning evidence was not merely cumulative impeachment because it would have impeached White as a liar—i.e., character for untruthfulness—rather than merely showing bias, payment, or criminal history.
  • Nonetheless, the evidence was not material because White’s account was strongly corroborated by other evidence supporting the verdict (testimony from Ard, Wright, Detective Cowan, and Agent Laiche; wiretap recordings; and video placing Long at Ard’s house).
  • Therefore, there was no Brady violation, and the district court did not plainly err in denying a new trial.

III. Analysis

A. Precedents Cited (and How They Drove the Outcome)

1. The Brady framework and materiality

  • Brady v. Maryland, 373 U.S. 83 (1963): Establishes the prosecution’s duty to disclose favorable evidence material to guilt or punishment. This case supplies the constitutional “suppression + favorability + materiality” architecture.
  • Miller v. Dretke, 431 F.3d 241 (5th Cir. 2005): The Fifth Circuit used Miller’s formulation of the three Brady elements, and its articulation that evidence is material if there is a “reasonable probability” of a different result.
  • United States v. Bagley, 473 U.S. 667 (1985): Two key roles here—(i) impeachment evidence can be “favorable,” and (ii) materiality is the “reasonable probability” standard, not an “acquittal more likely than not” test.
  • Kyles v. Whitley, 514 U.S. 419 (1995): The opinion invokes Kyles for the “undermine confidence in the outcome” concept and the holistic approach to evaluating suppression.
  • Turner v. United States, 582 U.S. 313 (2017): Used for the instruction that materiality must be assessed “in the context of the entire record,” reinforcing that a single impeachment item rarely controls when the overall evidentiary picture is strong.
  • Strickler v. Greene, 527 U.S. 263 (1999): Cited to clarify that materiality is not merely “minus the tainted evidence, does the remainder still suffice,” but whether disclosure would place “the whole case in such a different light” as to undermine confidence in the verdict.
  • Floyd v. Vannoy, 894 F.3d 143 (5th Cir. 2018): Reinforces that Brady materiality is not a probability-of-acquittal test, aligning the panel’s analysis away from “would probably produce an acquittal” phrasing (more typical of Rule 33).

2. Cumulative impeachment and corroboration as a materiality limiter

  • United States v. Sipe, 388 F.3d 471 (5th Cir. 2004): This is the opinion’s principal Fifth Circuit authority on when suppressed impeachment is not material—especially when it is cumulative and when the witness is strongly corroborated. The Long panel uses Sipe’s two recurring themes:
    1. additional impeachment is often not material if the jury already had reason to distrust the witness; and
    2. strong corroboration often defeats materiality even for significant impeachment.
  • Wilson v. Whitley, 28 F.3d 433 (5th Cir. 1994): Cited (via Sipe) for the corroboration principle and referenced again to rebut mistaken-identity style arguments—if the record makes confusion unlikely, impeachment suggesting confusion becomes less potent.
  • United States v. Perry, 35 F.4th 293 (5th Cir. 2022): Used comparatively. Perry illustrates diminished materiality when witnesses are already impeached and when jury instructions caution about credibility. Long distinguishes Perry on cumulative impeachment but ultimately follows Perry’s logic on the effect of cautionary instructions and corroboration.

3. Plain-error review and forfeiture shaping the appellate lens

  • United States v. Rojas, 812 F.3d 382 (5th Cir. 2016) and United States v. Rounds, 749 F.3d 326 (5th Cir. 2014): Provide the standard of review because the Brady argument was raised for the first time on appeal.
  • United States v. Ferguson, 211 F.3d 878 (5th Cir. 2000) and United States v. Olano, 507 U.S. 725 (1993): Supply the four-part plain-error framework and the discretionary fourth prong (fairness/integrity/public reputation). The court effectively never reaches prongs three and four because it finds no Brady error (no materiality).
  • Rollins v. Home Depot USA, 8 F.4th 393 (5th Cir. 2021): Invoked for forfeiture-by-inadequate-briefing—used here to confine the dispute to materiality because the Government did not brief suppression or favorability on appeal. (Notably, at oral argument the Government conceded the Manning evidence should have been disclosed, sharpening the case to materiality.)

4. Rule 33 “new trial” doctrine in the background

  • United States v. Piazza, 647 F.3d 559 (5th Cir. 2011), United States v. Wall, 389 F.3d 457 (5th Cir. 2004), and Berry v. State, 10 Ga. 511 (1851): These govern Rule 33 “newly discovered evidence” motions (the “Berry rule”). The district court denied relief largely because the Manning evidence was “merely impeachment” and unlikely to produce acquittal. On appeal, however, the court evaluated the issue through Brady materiality (a different test), highlighting a recurring tension: Rule 33’s “probably produce an acquittal” requirement is more demanding than Brady’s “reasonable probability” standard.

5. Other evidentiary and sufficiency-supporting citations

  • United States v. Abel, 469 U.S. 45 (1984): Cited to recognize impeachment by bias under the Federal Rules of Evidence, which the opinion contrasts with impeachment for character for untruthfulness (Fed. R. Evid. 608) and by convictions (Fed. R. Evid. 609).
  • United States v. Weintraub, 871 F.2d 1257 (5th Cir. 1989): Cited to support use of other acts/recordings as relevant to showing a “pattern of operation,” helping corroborate the conspiracy theory even when certain calls post-date the charged distribution event.
  • United States v. Garcia-Martines, 624 F. App'x 874 (5th Cir. 2015) and Thurmond v. United States, 377 F.2d 448 (5th Cir. 1967): Used to reinforce that circumstantial evidence can be as reliable as direct evidence—important to the panel’s rejection of the claim that White was the only “direct” link to the February 27 distribution.
  • United States v. Brown, 650 F.3d 581 (5th Cir. 2011) and Kutzner v. Cockrell, 303 F.3d 333 (5th Cir. 2002): Cited for the proposition that evidence is “suppressed” only if it was not discoverable through due diligence—though suppression was not ultimately litigated in detail in this appeal.

B. Legal Reasoning

1. The court’s methodological move: “Was it cumulative?” then “Was it corroborated?”

The panel followed a structured Brady materiality analysis keyed to Fifth Circuit practice under United States v. Sipe: it assessed (i) whether the withheld impeachment would merely add “more of the same” and (ii) whether the witness’s testimony was strongly corroborated by independent evidence.

2. Distinct impeachment value: character for untruthfulness

The opinion is careful to identify that the jury already heard substantial credibility attacks against White: extensive criminal history, paid-informant status, and theft of money/meth during a controlled buy in this very investigation. Yet the panel still found the Manning evidence not cumulative because it would have shown something qualitatively different: White had given false testimony in a similar controlled-buy context, i.e., evidence bearing on “character for untruthfulness” as distinct from bias or general criminality.

This matters doctrinally because Brady materiality is sensitive to the kind of impeachment: evidence that someone is a “paid informant” (bias) is not the same as evidence that the informant has recently fabricated controlled-buys in sworn testimony (truthfulness/fabrication).

3. The decisive step: corroboration and the “whole case” view

Despite acknowledging non-cumulative impeachment value, the court denied relief because the withheld evidence would not have changed the trial’s overall evidentiary picture. The panel catalogued corroboration:

  • Distribution count (Feb. 27, 2023): video placing Long at Ard’s house; White’s purchase-and-return narrative; and task-force testimony (Detective Cowan and Agent Laiche) that White returned with methamphetamine after being searched and equipped. Ard testified that he directed White to his house where Long “always” was.
  • Conspiracy count (Jan.–July 2023): cooperator testimony (Ard and Wright), pole camera/photographs (as described by the district court), and wiretap recordings demonstrating Long’s involvement and a pattern consistent with trafficking activity.

Applying Strickler v. Greene and Kyles v. Whitley, the panel concluded that even if jurors discounted White more heavily, the remaining evidence would not place the case “in such a different light” as to undermine confidence in the verdict.

4. The role of jury instructions in the materiality calculus

The court emphasized that jurors were instructed to treat paid-informant testimony “with great care” (Fifth Circuit Pattern Jury Instructions (Criminal) § 1.15 (2024)) and that convictions used for impeachment were only credibility factors (Pattern § 1.13 (2024)). Those instructions—together with existing impeachment—reduced the incremental effect of adding “one more” reason to distrust White, even one as sharp as prior false testimony, because the jury had already been alerted to scrutinize him.

5. Plain error as a backstop, not the engine

Although the standard of review was plain error (because Brady was first raised on appeal), the panel’s reasoning effectively ended at step one: no Brady materiality meant no error to correct under United States v. Olano. In practical terms, the opinion signals that defendants who do not litigate Brady below face an uphill climb, because they must first show a clear Brady violation before the court even considers prejudice and discretionary correction.

C. Impact

1. A clarifying rule for “separate-case perjury” impeachment

The decision reinforces a pragmatic Fifth Circuit principle: even powerful impeachment (prior false testimony) may be immaterial when the witness’s account is strongly corroborated by independent evidence, especially in controlled-buy cases where law enforcement procedures (searching the informant, equipping devices, receiving drugs afterward) and recordings create an evidentiary scaffold beyond the informant’s word.

2. Doctrinal nuance: non-cumulative does not equal material

Long is notable for separating two concepts that are sometimes conflated in practice: (i) the withheld impeachment may be “different in character” (not cumulative), yet (ii) still not “material” under Brady given the whole record. Future litigants can cite this structure—particularly when arguing about informant misconduct—while recognizing corroboration can still defeat relief.

3. Litigation incentives: raise Brady promptly and build a record

Because the Brady theory appeared first on appeal, the case illustrates the cost of not litigating constitutional disclosure claims in the district court: plain-error review and an appellate record focused on trial evidence rather than discovery practices. Defendants and counsel are incentivized to press Brady early (motions to compel, in camera review, continuances) to avoid being boxed into appellate materiality alone.

4. Prosecutorial practice: disclosure even if materiality is debatable

The Government’s acknowledgment at oral argument that the Manning evidence “should have been disclosed” underscores a best practice: disclose informant credibility problems—even from other cases—because appellate courts may differ on materiality, and nondisclosure can trigger post-trial litigation, undermine confidence, and risk reversal in closer cases.

IV. Complex Concepts Simplified

  • Brady evidence: Information the prosecution must disclose if it helps the defense and is important enough that hiding it could affect the trial’s fairness. It includes both exculpatory evidence and impeachment evidence.
  • Impeachment evidence: Evidence used to challenge a witness’s credibility. The opinion distinguishes:
    • Bias impeachment (e.g., paid informant, incentive to please the Government);
    • Criminal-history impeachment (Fed. R. Evid. 609);
    • Character for untruthfulness (Fed. R. Evid. 608)—the Manning evidence fits here because it concerns false testimony.
  • Materiality (Brady): Not “would the defendant probably be acquitted,” but whether there is a “reasonable probability” that disclosure would have changed the result—i.e., whether nondisclosure undermines confidence in the verdict.
  • Cumulative impeachment: Additional credibility attacks that mostly repeat what the jury already knows (e.g., “more reasons he’s untrustworthy”), often not enough to be material.
  • Strong corroboration: Independent evidence (other witnesses, recordings, surveillance, physical evidence) that supports the witness’s story. When corroboration is strong, withheld impeachment is less likely to be material.
  • Plain-error review: A stricter appellate standard used when the argument was not raised below. The defendant must show a clear error that affected substantial rights, and even then the court may decline to correct it.

V. Conclusion

United States v. Long affirms that impeachment evidence showing a confidential informant lied in a separate federal case can be qualitatively distinct (not merely cumulative) yet still not material under Brady when the informant’s trial testimony is strongly corroborated by other evidence and the jury is instructed to scrutinize informant testimony with caution.

The opinion’s most durable contribution is its structured approach: identify the impeachment’s character (bias vs untruthfulness), then decide whether the withheld evidence would realistically change the “whole case” picture. In controlled-buy prosecutions with layered corroboration, Long signals that separate-case informant misconduct—while disclosure-worthy—may not meet Brady’s materiality threshold absent a closer evidentiary contest.