ANSWERS: 1
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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
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