An Assessment of the Validity of Polygraph Examinations for the Psychophysiological Detection of Deception: A Judicicial Opinion and Research Study Review

The polygraph device has been advanced by proponents as a valid (measures what it is supposed to measure, even against counter-measures), accurate (it does what it is supposed to do), and reliable (produces consistent outcomes) diagnostic tool able to measure physiological responses indicative of deception. These physiological responses are said to be a direct result of psychological arousals. (National Research Council [NRC] of the National Academies, The polygraph and lie detection, 2003). A debate concerning the validity of this test instrument has maintained for over 85 years, since the first polygraph device was introduced. This analysis takes into account court cases that address the issue and the available literature and relevant studies that support judicial decision-making. The conclusion arrived at is that this particular testing device has not attained a level of scientific support to warrant unqualified judicial acceptance.