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 the course of the committee’s work, we reviewed some material on the origin and history of polygraph testing. Some of this material is presented here because it provides interesting context and ...

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 ...

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 ...

She was one of the brightest students at a leading university when the Central Intelligence Agency offered her a job as a counter-terrorism analyst. But first, the 19-year-old was warned, she had to ...