The American Experience film tells a story of honest intentions and sinister consequences.
In the century after its invention, the lie detector’s popularity skyrocketed. And despite a checkered legacy, polygraph tests are still regularly used by law enforcement and some employers.
The documentary tells a story of honest intentions and sinister consequences. John Larson, one of its inventors, was a medical student and law enforcement officer in search of more humane methods of policing and interrogation. He piggybacked off new scientific and psychological concepts to create the device in 1921.The technologies Larson and his co-inventors used were still in their infancy, and the idea that people produce measurable, consistent physical symptoms when they lie was unproved.
It still is. Polygraph protocols have evolved, but the devices’ detractors say they measure only anxiety, not truthfulness. And even as major organizations have
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