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 whether someone is lying. In movies, the polygraph is always right, But, in 1998, the US Supreme Court ruled that there was no consensus that the polygraph was reliable. This conclusion was supported by the US National Academy of Scientists 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