Who invented polygraph, the lie detector?

The polygraph was invented in 1921 by John Augustus Larson, a medical student at the University of California at Berkeley and a police officer of the Berkeley Police Department in Berkeley, California.The polygraph was on the Encyclopædia Britannica 2003 list of greatest inventions, described as inventions that "have had profound effects on human life for better or worse."

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Martin Retzolk

Actually, this is another answer that is not quite true, because the question asks who was the inventor of the lie detector, not the modern-day lie detector. The History of the Polygraph Machine In 1902 an inadequate lie detector test was invented by a man named James McKenzie. Later on, in the 18th century, 1921, a medical student named John Larson from the University of California invented the modern polygraph instrument, which was much more accurate in its results than the previous machine.