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The Polygraph machine was created byJohn Augustus Larson in 1921. He was a medical student at the University of California at Berkeley. It is also known as the lie detector. It is used to Detect lies. It detects lies by monitering changes in blood pressure and Galvanic skin responce.
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In the summer of 1921 John Larson was asked by the San Francisco Police Department to test a a man named William Hightower who was accused of murdering a priest. The results came up positive and he was convicted.
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In 1926 a polygraph machine was featured in the moving picture officer 444.
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On October 1st 1965 the inventor of the Polygraph machine died. John Larson was 72 when he died and he died at Berkeley in California.
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The Encyclopædia Britannica considered the polygraph one of the greatest inventions ever on its 2003 list of the greatest inventions.