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.
What happened in 1998?
The Supreme Court could not confirm that polygraphs are reliable The Supreme Court decided to prohibit the use of polygraphs The US National Academy of Scientists said it cannot confirm that polygraphs are reliable The European Union decided that polygraphs are not reliable