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 Federal Bureau of Investigation (FBI) has found itself embroiled in a rather odd situation involving polygraph tests. In April, it confirmed to NPR that it was using these tests to catch personnel ...

In 1921, John Augustus Larson, a medical student and police officer in Berkeley, California invented a machine to help detectives determine if someone was telling the truth - or lying. He called it - ...

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 ...

In ancient China, a spit-out portion of rice revealed whether a person was telling lies—dry rice indicated the dry mouth of a liar. Sound unreliable? So is the polygraph test. Literally meaning "many ...