The Invention of the lie detector by James Mackenzie, 1902

James Mackenzie in 1902 invented the first less successful lie detector. The modern lie detector also called polygraph was invented in 1921 by John Larson.

It was used in the police interrogations and investigations since 1924, and it’s still controversial among psychologists and is not always judicially acceptable. It’s name “polygraph” comes from the fact that the machine records several different body responses simultaneously as the individual is questioned.

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The modern lie detector invented in 1921 by John Larson

The modern lie detector invented in 1921 by John Larson