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YouTubeDiscovery UK
The Science Behind Lie Detector Tests | How Do They Do It?
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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