The polygraph was created in 1921 by policeman John Larson, based on research by the psychologist William Marston. It records changes in pulse, blood pressure, sweating and breathing to find out if someone is lying. In movies, the polygraph is always correct but, in 1998, the US Supreme Court decided that there was no agreement that the polygraph was reliable. The US National Academy of Scientists said the same thing in 2003.
Who was John Larson?
A policeman who developed a lie-detection method A psychologist who created the polygraph A US Supreme Court judge who ruled on the reliability of the polygraph A 21st century researcher working on new methods of lie detection