POLYGRAPH
polygraph,n. A device used to evaluate truthfulness by measuring and recording involuntary physiological changes in the human body during interrogation. • Polygraph results are inadmissible as evidence in most states but are commonly used by the police as an investigative tool. — Also termed lie detector. [Cases: Criminal Law 388.5; Evidence 150. C.J.S. Criminal Law § 760; Evidence §§ 216–226.] — polygraphic,adj. — polygraphy,n.
[Blacks Law 8th]