Research is identifying alternative methods to the polygraph, but some doubt whether true lie detection is possible.

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 ...

Even if polygraph tests are not accurate, the threat of a test can serve as a deterrent or as an interrogation tool to elicit admissions. Leonard Saxe is a professor of Contemporary Jewish Studies and ...