United States v. Bagley

1985-07-02

Headline: Limits automatic reversals for undisclosed witness payments and adopts a 'reasonable probability' test, reversing the Ninth Circuit and remanding to decide if withheld reward contracts undermined a defendant’s drug conviction.

Holding: The Court held that evidence withheld by prosecutors is material only if there is a reasonable probability that disclosure would have changed the trial result, reversing the Ninth Circuit and remanding for factual review.

Real World Impact:

Makes prosecutors' failure to disclose impeachment evidence reversible only if it likely changed the outcome.
Requires lower courts to ask whether nondisclosure undermines confidence in the verdict.
May reduce automatic reversals but increases factual remands for hearings.

Topics: prosecutor disclosure, witness payments, fair trial rights, criminal appeals

Summary

Background

A man charged with drug and firearms offenses was tried in federal court after waiving a jury. Two private security guards who worked with federal agents testified against him. Before trial the defense asked the Government to disclose any deals or payments to witnesses. The Government produced affidavits saying there were no promises, but years later the defendant obtained ATF forms showing possible payments of about $300 contingent on helpful information. He sought to undo his sentence, the district judge found the payments likely but harmless, the Ninth Circuit reversed, and the Supreme Court took the case.

Reasoning

The Court addressed the key question: what standard decides whether withheld evidence is important enough to overturn a conviction? Relying on earlier cases, the Court held that evidence is “material” only if there is a reasonable probability that, had the defense seen it, the trial result would have been different. The Court rejected the Ninth Circuit’s rule of automatic reversal whenever requested impeachment evidence was withheld. The Court reversed that decision and sent the case back for the appeals court to determine whether the undisclosed payment contracts created a reasonable probability of a different outcome.

Real world impact

The ruling affects criminal trials: prosecutors still must disclose favorable evidence, including information that could show witness bias, but failure to disclose will overturn a conviction only when nondisclosure likely undermines confidence in the verdict. This was not a final finding that the defendant must be freed; the case was remanded for further factual review.

Dissents or concurrances

Justice White agreed with the reasonable-probability standard. Justices Marshall and Stevens dissented, arguing for stricter disclosure rules or automatic reversal when the Government hides impeachment evidence of key witnesses.