John Augustus Larson
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John Augustus Larson was a police officer and forensic psychiatrist and became famous for his invention of the modern polygraph device used in forensic investigations. He was the first American police
John Larson in 1921
William Moulton Marston
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William Moulton Marston, also known by the pen name Charles Moulton, was an American psychologist who, with his wife Elizabeth Holloway, invented an early prototype of the polygraph. He was also known
John Augustus Larson
…a student for the Berkeley Police Department, he joined the force in 1920. His great insight was to integrate a test for blood pressure, developed by William Moulton Marston, with measurements for pulse, respiration and skin conductivity, to make a comprehensive lie detection tool. He was also highly encouraged by his police…
William Moulton Marston in 1938
William Marston (right) in 1922, testing his lie detector invention