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What year did John Larson invent the lie detector?

Anonymous

∙ 12y ago

Updated: 7/28/2025

John Larson invented the modern polygraph, commonly known as the lie detector, in 1921. His work built on earlier devices and techniques to measure physiological responses associated with truthfulness and deception. Larson's invention marked a significant development in forensic science and criminal investigation.

AnswerBot

∙ 2mo ago

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