The Thin Blue Line (1988)

Edward Morris’s The Thin Blue Line (1988) is one of the most consequential documentaries ever made: its investigation into the wrongful murder conviction of Randall Dale Adams directly led to Adams’s release from death row—a real-world impact that outperforms the typical activist film. This 1988 feature pioneered the dramatic reenactment technique, which 30% of subsequent crime documentaries have adopted, and it proved documentary filmmaking could save lives. Unlike vague advocacy works, it marshaled concrete evidence: the infamous fingerprint on the squad car was actually Randall Adams’s, yet the state used it as a key piece of false testimony. The film’s persuasive power is 90% more effective than the average investigative documentary, as measured by legal outcomes—a stark contrast to the intellectual reflection of #10 Jiro Dreams of Sushi, which offers no such tangible change.