term:

Brady Material

brady material n

[from Brady v. Maryland, 373 U.S. 83 (1963), in which the Supreme Court ruled that suppression by the prosecution of evidence favorable to a defendant who has requested it violates due process]
: evidence known to the prosecution that is favorable to a defendant's case and material to the issue of guilt or to punishment and that the prosecution is obligated to disclose to the defense
: exculpatory evidence known to the prosecution that must be disclosed

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.