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Polygraph

Murray
by

Brandon Davis

on 17 May 2010

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Transcript of Polygraph

How it works: The Polygraph The polygraph, or lie detector, is a device used to detect if some one is telling the truth or not. Lie detectors are a combination of medical devices used to measure biological funtions of the body, such as heart rate, blood pressure, respiratory rate, and electro-dermal activity. Polygraphs are used for law enforcement agencies, such as the FBI, CIA, DEA, ATF, and local police. The polygraph can tell if you are lying through a series of questions. The tester first asks the subject a question that is known to be true, such as your name, date of birth, where you live, etc. This is to establish a base reading on the previously mentioned biological funtions When the subject answers a question untruthfully the biological funtions will be noticeably diffrent than the baseline reading. The polygraph is still considerd an unreliable source due to the many possible variables as to why the readings can come back as the person lying.
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