The Thin Blue Line is a 1988 American documentary film by Errol Morris, about the trial and subsequent conviction of Randall Dale Adams for the murder of Texas police officer Robert Wood. Morris became interested in the case while doing research for a film about Dr. James Grigson, a psychiatrist known in Texas as "Dr. Death" for testifying with "100 percent certainty" of a defendant's recidivism in many trials, including that of Randall Adams. The film centered around the "inconsistencies, incongruities and loose ends" of the case, and through his investigation, not only comes to a different conclusion, actually obtained an admission of Adams' innocence by the original suspect of the case, David Harris. The "thin blue line" in the title "refers to what Mr. Morris feels is an ironic, mythical image of a protective policeman on the other side of anarchy".

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