On tonight's Penn & Teller: Bullshit, an episode examining lie detectors. A lot of people put their faith in polygraphs, including many folks involved in law enforcement.
Check out the website of the American Polygraph Association here, an article from the Committee to Review the Scientific Evidence on the Polygraph, Board on Behavioral, Cognitive, and Sensory Sciences and Committee on National Statistics, Division of Behavioral and Social Sciences and Education, National Research Council, and the Supreme Court case, U.S. v. Scheffer. Here's more information on polygraph evidence in the courts. The results of lie detector tests are not necessarily admissible in all U.S. jurisdictions and in all proceedings. For information on how a lie detector (polygraph) works, see here.
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