The U.S. Supreme Court in Brady v. Maryland, 373 U.S.83 (1963) established that criminal defendants have a due process right to the disclosure of exculpatory material. Although Brady was decided 60 years ago, suppression of exculpatory material by prosecutors and the police remains a major problem. It is a leading cause of wrongful convictions. In many wrongful conviction cases the defendant was exonerated only after being incarcerated for many years., in some cases on death row.