The Science Behind Lie Detector Tests | How Do They Do It?
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03/31/18
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Discovery
Find out the history of lie detectors, and how the modern polygraph machine works to catch people lying. Subscribe to Discovery UK for more great clips: http://www.youtube.com/subscription_center?add_user=DiscoveryTV Follow Discovery UK on Twitter: http://www.twitter.com/DiscoveryUK
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