Polygraph/Lie Detector Testing

Polygraph/Lie Detector Testing

A lie detector also called a polygraph instrument is used for recording physiological phenomena such as blood volume, respiration, pulse rate, galvanic skin response and cognitive processing of a human subject as he/she answers a series of questions put to them by a trained operator. Physiological phenomena usually chosen for recordings are those not greatly subject to voluntary control. This data is then used as the basis for making a judgment as to whether or not the subject is lying. With the addition of specialised computerised software, polygraph results are extremely reliable. Polygraph instruments have been used in police interrogation and investigation since 1924 in various forms, and are widely used to this day as a investigation tool for the FBI the CIA and most the Federal Government agencies in the USA and 69 countries around the world including here in Australia.