The Thin Blue Line (1988)

Official trailer

The Thin Blue Line is Errol Morris’s 1988 American documentary depicting the 1976 murder of a Dallas police officer and the later conviction of Randall Adams, which the production argues was wrongful while another man, David Harris, committed the crime. American Playhouse and Third Floor Productions produced the film. It contributed directly to Adams’s release from prison after the conviction was overturned, and it has built a reputation as among the most consequential documentaries in American cinema.

Anger is what this film leaves me with, and for a documentary I can’t think of higher praise. Morris turns the form into an investigation with real consequences, and he does it with such formal precision that I forget I’m watching a case being built. A man’s freedom hung on what this film showed, and it shows it so well that the injustice feels personal. It established Morris’s later career and shaped the investigative documentaries that followed.

The Reconstructive Approach

Reconstruction sequences open The Thin Blue Line and recreate the murder and its surrounding events through multiple versions reflecting different witness accounts. The approach works by visualizing the contradictions within the case’s evidence. It generates engagement that conventional documentary interviewing alone couldn’t provide. The reconstructions work through stylized photography that signals their constructed status. The form allows the production to use dramatic visualization without claiming documentary fidelity for the reconstructed material. The result left a template that later investigative documentaries including Capturing the Friedmans (2003) extended.

The reconstructions are what hooked me. Seeing the same shooting staged again and again, each time the way a different witness swore it happened, shows me the case falling apart better than any lawyer could explain it.

The Interview Approach

Morris conducts the extended interviews with case participants in The Thin Blue Line in long, fixed setups and lets them talk. His Interrotron, the device that lets subjects address the camera directly, came later, on Fast, Cheap & Out of Control (1997). This builds intimacy and authority that the investigative content required.

The final interview with David Harris, where his ambiguous statements about the actual killer effectively confirm his own guilt, is the film’s resolution. That interview gives me chills. Morris just lets Harris talk, and Harris talks himself into a confession without ever quite making one. I can’t think of a more devastating ending to a documentary.

The Philip Glass Score

Philip Glass’s score for The Thin Blue Line runs through repetitive minimalist textures supporting the investigative content. It generates uncanny atmosphere that conventional documentary scoring wouldn’t provide. The result makes clear how minimalist music can encode investigative tension through gathered repetition.

The score is the film’s defining element for me. Glass’s repeating figures sound like a mind going over the same evidence and getting nowhere, and I think that’s the feeling the whole film runs on. My one complaint is that it sometimes presses too hard, and a couple of the reconstructions would hit harder in silence.

Is The Thin Blue Line as good as people say?

A 9 from me, and it misses the 10 only because the score and the stylized reconstructions sometimes push harder than the material needs. Everything else is as good as documentary gets.

Morris investigates, the Harris interview does the rest, and a wrongly convicted man got out of prison partly because of what’s on screen. If you care about documentaries or about how the justice system goes wrong, this is mandatory viewing.

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