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 ...

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 ...

The term “lie-detector” suggests that a polygraph machine can detect lies. However, this device, which is commonly used in criminal investigations, actually measures nervous excitement. It operates on ...

Malfunctions in polygraph equipment operated by the Pasco County Sheriff's Office date to July 1990, according to records released by sheriff's officials Thursday. The records, released at the request ...