Add Yahoo as a preferred source to see more of our stories on Google. American inventor John Larson, right, demonstrates the operation of a polygraph at Northwestern University in Evanston, Illinois, ...

The polygraph is not a lie detector but rather an instrument that measures a person’s physiological changes to questions posed by the examiner. An elevated physiological response to a particular ...

Science says you might as well flip a coin.

Jerry Lewis, a retired New Jersey State Police lieutenant who has been administering polygraphs since 1981, joins host Matt Adams to peer inside the mechanics of the test. They explore the science at ...