THE POLYGRAPH AND LIE DETECTION: ITS USE IN THE NIGERIAN LEGAL SYSTEM

Abstract

The polygraph, also known as a lie detector is a device that measures physiological responses like heart rate, blood pressure and perspiration while a person is asked questions. The assumption is that these physiological changes can indicate whether someone is lying or telling the truth. The objective of this work is to find out whether the polygraph and its results are used in the Nigerian legal system. The doctrinal method of research was employed. The findings of the work show that while the polygraph tests are used in Nigeria, their widespread use is not fully established particularly within the legal system. The work recommends for training for the Nigerian law enforcement investigation departments especially for security screenings involving theft, fraud, computing and violent crimes.