S7, E5

Lie Detectors

Original Air Date: Jul 23, 2009

Polygraphs are used in thousands of investigations and job screenings, but can a machine really detect whether someone is lying? Penn and Teller meet people whose lives were ruined by faulty lie-detector results.

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Sneak Peek: Faulty Premise

Sneak Peek: Faulty Premise

8 Seasons, 89 Episodes

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  • Season 8

    Penn & Teller take on cheerleaders, fast food, teen sex, seniors, vaccinations, and more.

    Season 8
  • Season 7

    Penn & Teller trash astrology, video games, the Apocalypse, organic food, lawns, the Vatican, and more.

    Season 7
  • Season 6

    Penn & Teller debunk porn, new age medicine, dolphins, insomnia, sensitivity training and more.

    Season 6
  • Season 5

    Penn & Teller take on obesity, Walmart, immigration, Mt. Rushmore, anger management, & more.

    Season 5
  • Season 4

    Penn & Teller debunk the Boy Scouts, the death penalty, Bigfoot, pet love, abstinence, and more.

    Season 4
  • Season 3

    Penn & Teller take on circumcision, conspiracy theories, life coaching, political correctness, religious icons and more.

    Season 3
  • Season 2

    Penn & Teller debunk PETA, the war on drugs, tantric sex, the moral minority, fitness, and more.

    Season 2
  • Season 1

    Penn & Teller take on psychics, chiropractors, second hand smoke, feng shui, dieting, and more.

    Season 1
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