Lie Detector Test Knowledge Hub

Latest news, social media watch, case studies, and industry publications.

Welcome to our Polygraph/Lie Detector Knowledge Hub! Our team of Accredited Polygraph Examiners share valuable insights, articles, and client stories on polygraph testing and lie detection. From exploring the science behind polygraph tests to real client success stories, our Knowledge Hub provides information for all audiences.

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Reading

Lie Detector Test Reading is your trusted ally for confidential polygraph services. With a transparent price of $800 and no hidden fees, we provide a fair and cost-effective solution to dispel your doubts.

Erie

Lie Detector Test Erie is your trusted ally for confidential polygraph services. With a transparent price of $800 and no hidden fees, we provide a fair and cost-effective solution to dispel your doubts.

Allentown

Lie Detector Test Allentown is your trusted ally for confidential polygraph services. With a transparent price of $800 and no hidden fees, we provide a fair and cost-effective solution to dispel your doubts.

Pittsburgh

Lie Detector Test Pittsburgh is your trusted ally for confidential polygraph services. With a transparent price of $800 and no hidden fees, we provide a fair and cost-effective solution to dispel your doubts.

John Larson – The Innovator of Polygraph Science

John A. Larson, a true innovator, developed the world's first accurate lie detector device, laying the foundation for the modern polygraph machine. Larson's interest in deception detection began with the work of William Moulton Marston, where he measured changes in blood pressure, pulse rate, respiration, and electrical skin conductivity. Larson advanced Marston's work, modifying an Erlanger Sphygmomanometer to record changes in blood pressure using a smoked paper drum and a kymograph. Larson published several papers on his instrument, which served as the foundation for Leonard Keeler's advancements in the 1920s and 1930s, earning Larson a spot in history as one of the biggest contributors to the improvement of criminology and criminal interrogation techniques.

John Larson at right demonstrating his "polygraph" lie detector machine at Northwestern University about 1936