Nationwide Investigations Group
lie detection, Infidelity Enquiries, polygraph testing
Polygraph is a generic name for an instrument which is commonly known as a 'Lie Detector'. Contrary to popular belief, it does not record directly whether a person is lying or telling the truth; it records changes which take place in the body during stress.
A modern Polygraph Machine
A Polygraph Instrument is, in effect, a sophisticated piece of medical equipment which measures autonomic nervous reactions which take place in the human body when an 'important', or incriminating, lie is told. These responses are usually not visible to the eye. The physiological reactions which occur when a person tells a lie are measured by recording respiration, cardio-vascular reaction and skin moisture changes.
Since the beginning of the twentieth century, the Polygraph has been widely used, particularly in the USA, by Governments and Law Enforcement Agencies - always with the full consent of the subject. Experts claim an accuracy of up to 99% in their findings and no other systems used for lie detection purposes have come close to the range of accuracy achieved by the Polygraph.
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