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How Do Polygraph Machines Work?
3:12
YouTubeBrainStuff - HowStuffWorks
How Do Polygraph Machines Work?
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 episode of ...
195.6K viewsNov 1, 2013
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#polygraph
BLACK BAG - "Polygraph" Official Clip
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