Giglio v. United States
United States Supreme Court
405 U.S. 150 (1972)
Relevant factsFree
The government offered Giglio's alleged co-conspirator Taliento immunity in exchange for his testimony against Giglio (defendant), but a different prosecutor tried the case and never corrected Taliento's trial testimony that he had received no promise of leniency; Giglio was convicted, and only after appealing did he learn of the immunity deal. The Supreme Court granted certiorari to determine whether this undisclosed evidence violated due process under Brady v. Maryland.
IssueFree
Whether, under Brady, evidence that might impeach the prosecution's witness is material exculpatory evidence that must be turned over to the defense.