lie detector test
The popular name for a polygraph, which tests a person's physiological response (for example, changes in blood pressure and respiration) to questions asked by a testing expert to judge whether the person is telling the truth. The test's reliability is a matter of ongoing controversy, and in most U.S. states polygraph test results are not admissible in court.
Category: Small Claims Court & Lawsuits

Nolo’s Plain-English Law Dictionary. . 2009.

lie detector test
n.
   a popular name for a polygraph which tests the physiological reaction of a person to questions asked by a testing expert. A potential or actual criminal defendant or possible witness cannot be forced or ordered to take a lie detector test. Some habitual liars pass lie detector tests, and innocent, honest people fail them due to nervousness and other factors. However, law enforcement authorities usually believe the results, which occasionally exonerate (clear) a suspect. Since the results are sometimes unreliable, they are not admissible in a trial and may not be referred to.
   See also: polygraph

Law dictionary. . 2013.

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