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by Answerbag Staff on October 28th, 2009

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When was the first lie detector made?

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  • by Tanya Irvin on October 28th, 2009

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    Professionally Researched. (What's this?)

    The first modern lie detector was fashioned in 1921 by John Larson, a forensic scientist working for the Berkeley Police Department. Known as a polygraph, it recorded a person's blood pressure, pulse and respiratory rates on a drum of paper.

    Source:

    Police interrogation and American Justice; Richard A. Leo; 2008

    The Lie Detectors: The History of an American Obsession; Ken Alder; 2009

    The Polygraph: The Modern Lie Detector

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