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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.
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![](https://image.tmdb.org/t/p/w300/wJCFc9HzNcXhcURRzeQbA71o2hM.jpg)
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![](https://image.tmdb.org/t/p/w300/tcyxDxp3ojtYf686OpchfqkpbEl.jpg)
Other episodes for this season
![Orgasms](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![Astrology](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![Video Games](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![The Apocalypse](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![Lie Detectors](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![Organic Food](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![Taxes](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![Lawns](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![Stress](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
![The Vatican](https://image.tmdb.org/t/p/w300/e23KDV1ejCknrTXogNRGVNovVFa.jpg)
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.