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How Polygraph Machines Work

How Polygraph Machines Work

BrainStuff

December 3, 20082m 4s

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Show Notes

Also known as 'lie detectors,' polygraphs are used to record an individual's vital signs, such as breathing rate, pulse, and so forth. Check out this podcast from HowStuffWorks to learn more about polygraphs and the art of lie detection.

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