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What is a
Polygraph?
A polygraph
(commonly referred to as a lie detector) is an instrument that measures
and records several physiological responses such as blood pressure,
pulse, respiration and skin conductivity while the subject is asked and
answers a series of questions, on the basis that false answers will
produce distinctive measurements. The polygraph measures physiological
changes caused by the sympathetic nervous system during questioning.
Within the U.S. federal government, a polygraph examination is also
referred to as a psychophysiological detection of deception (PDD)
examination. Several other technologies are also used in the field of
lie detection, but the polygraph is the most famous.
Some private investigators offer polygraph examination services. Visit
our Private Investigator Directory
to find a polygraph examination provider in your area.
Following
are resources for polygraphs, polygraph testing, and related resources.
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