At the FBI, for example, about 25 percent of applicants fail a polygraph exam each year, according to the bureau's security director. The polygraph has emerged as a pivotal tool in the CIA's ...

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 ...

About two weeks ago, I received word that a close friend of mine from elementary school (I'll be altering a few details to protect this friend's identity) - let's call her Ellen - failed a required ...