The Brady Doctrine, a cornerstone of criminal procedure in the United States, emanates from the landmark Supreme Court case Brady v. Maryland, 373 U.S. 83 (1963). The case fundamentally reshaped the landscape of prosecutorial responsibilities and defendants' rights concerning exculpatory evidence.

Over the years, Brady has given rise to a significant body of case law, known as Brady progeny, which further refines and defines the contours of the government’s obligation to disclose exculpatory evidence. These cases have addressed critical issues such as materiality, the scope of prosecutorial responsibility, and the timing of disclosures. The following is a comprehensive list of key Brady progeny cases that continue to shape the landscape of criminal justice:


Expanded Brady by requiring the disclosure of any deal made with a witness in exchange for their testimony.

Clarified that the prosecution’s duty to disclose extends to both requested and unrequested evidence if it is material.

Defined "material" evidence as that which would create a reasonable probability of a different outcome if disclosed.

Emphasized that the cumulative effect of undisclosed evidence must be considered in determining materiality.

Reiterated the need for material evidence disclosure and introduced the concept of "cause and prejudice" in procedural default.

Reinforced that prosecutors must disclose evidence even if the defense does not specifically request it.

Highlighted the importance of cumulative materiality and reinforced the Brady standards in the context of habeas corpus proceedings.

Held that undisclosed evidence that undermines the credibility of a witness can be material.

Highlighted the Brady obligation to disclose evidence that could impeach a witness’s credibility.

Affirmed that prosecutors must disclose evidence favorable to the accused even if they do not believe it is material.

Discussed the failure to disclose a witness's criminal history as a Brady violation.

Addressed delayed disclosure and its impact on the defense’s ability to use the evidence effectively.

Emphasized that fabricating evidence or misleading the jury violates Brady.

Applied Brady to state-level proceedings and reinforced the materiality requirement.

Required disclosure of all evidence that might be favorable to the defense, including impeachment evidence.

Discussed the consequences of nondisclosure and its impact on the fairness of the trial.

Required the prosecution to disclose any information that could be favorable to the defense.