The Thin Blue Line (1988)

Errol Morris's The Thin Blue Line (1988) set the template for investigative true crime filmmaking, directly leading to Randall Dale Adams's exoneration from death row after 12 years of imprisonment. Its dramatic reenactments and innovative score influenced every subsequent doc, yet it outperforms #9's modern approach by proving direct societal impact—a 100% exoneration rate for its subject. At 103 minutes, this seminal work remains 30% shorter than the average true crime feature, proving that concise storytelling can achieve measurable justice where others only entertain.