The Polygraph Instrument is a device designed to detect and record physiological functions of the body, such as pulse rates, increases and decreases in blood pressure, respiration rate and changes in electrodermal activity. Under controlled conditions, a Polygraph examiner can evaluate physiological changes that determine if they are consistent with truthfulness or attempted deception.
Polygraph examinations are useful as part of the pre-employment screening process, infidelity investigations, and a range of civil and criminal investigations.