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Penn & Teller: Bullshit!

Season 7 Episode 5

Lie Detectors

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Aired Monday 10:00 PM Jul 23, 2009 on Showtime
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Episode Summary

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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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