The Thin Blue Line (1988)
Director: Errol Morris
Private detective turned documentary filmmaker extraordinaire, Errol Morris and his film The Thin Blue Line got an innocent man out of prison. How's that for impactful? While investigating a prosecution psychiatrist named Dr. James Grigson, Morris beame interested in the case of Randall Dale Adams, who was sentenced to life in prison for murder.
In November 1976, a Dallas police officer was shot and killed during a traffic stop. Adams, who was riding in the car with a man named David Ray Harris, was convicted of killing the shooting, but through recreations and new interviews, Morris proves his innocence. Powerful stuff.