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 ...

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, known more commonly as the “lie detector,” has a long and controversial history as a forensic tool, but it has also been used in a variety of other contexts, including employment ...