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The effectiveness of polygraphs.

A polygraph, more commonly known as a lie detector, measures and takes record of a number of physiological indicators such as pulse, blood pressure, respiration, and skin conductivity while a subject is asked to answer a sequence of questions.

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The truth about lie detection

Lie detection, also known as deception detection, uses interrogative techniques accompanied by technology that records physiological functions to determine truth and falsehood in a particular response. It is frequently used by law enforcement and has in the past been seen as an inexact science. There is a wide variety of technologies existing for this purpose.

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