The polygraph was invented in 1921 by Dr. John Larson, a 27-year-old University of California Berkeley medical student with a Ph.D. in physiology. Dr. Larson worked as a part-time police officer at the Berkeley Police Department under Chief August Vollmer. Larson had read a 1908 book called On The Witness Stand by the Harvard psychiatrist, Hugo Munsterberg who had b...
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