Reed v. Texas

(1) How a court should consider under the Brady materiality standard the impact of a key trial witness's assertion of the privilege against self-incrimination and refusal to testify when confronted with the suppressed exculpatory evidence; (2) when expert testimony relied on by the state in a criminal trial is later shown to be scientifically invalid, what is the appropriate standard to assess whether the state"s use of the testimony violated due process; and (3) whether the conviction or execution of a person who is actually innocent of a crime violates the U. S. Constitution.