Lie Detectors

July 23, 2009
83.0%

Penn & Teller: Bull! - S7 - E5

Lie Detectors

Polygraphs are used in thousands of investigations and job screenings. Can a machine really detect whether someone is lying? Penn & Teller will meet people whose lives were ruined by the faulty tests.

Penn & Teller: Bull!: Season 7 - 10 Episode s