--- title: "United States v. Bagley" citation: "United States v. Bagley, 473 U.S. 667 (1985)" authority_id: "AUTH-SCOTUS-BAGLEY-473-US-667" authority_type: "case" jurisdiction: "federal_nationwide" precedential_status: "binding" official_url: "https://www.govinfo.gov/content/pkg/USREPORTS-473/pdf/USREPORTS-473-667.pdf" url: "https://jason93.com/legal/federal-process/authorities/AUTH-SCOTUS-BAGLEY-473-US-667/" legal_review: "2026-08-25" links_checked: "2026-10-15" links_available: 1 links_checked_count: 1 license: "CC BY 4.0" --- # United States v. Bagley ## Holding used Impeachment evidence is favorable evidence, and nondisclosed evidence is material when a reasonable probability of a different result is sufficient to undermine confidence in the outcome; the formulation covers no-request, general-request, and specific-request cases. ## Material limitation The opinion contains separate writings. The module relies on the materiality formulation adopted by the controlling combination identified in the decision and later applied by *Kyles*. ## Official source and pinpoints 473 U.S. 667, 676–85 (1985): ## Used in - [Arraignment and Pretrial Disclosure](https://jason93.com/legal/federal-process/modules/20-pretrial/arraignment-and-pretrial-disclosure.md)