Getting the better understanding of truth: Diving into the polygraph test

The field of forensic psychology has been growing in prominence in the past couple of decades. Psychology is used to detect the deception of the persons are involved in many areas that relate to crime, both solving crime and absolving people wrongly accused of committing crimes. The goal of lie detection is the discovery of a truth that is known to one person and concealed from others. Psychophysiological lie detection, or polygraphy, is based on the theory that lying produces particular emotions, which produce corresponding measurable physiological responses. Modern polygraphy measures blood pressure, breathing, and skin conductance. Alternative metrics such as voice stress analysis and functional magnetic resonance imaging are as yet unproven. The control question test uses relevant, control, and irrelevant questions. A larger response to the relevant questions is considered evidence of deception. The guilty knowledge test uses concealed information questions and irrelevant questions.Through this article authors have tried to report that how the polygraph examination of real cases is important and helpful to the investigating officer, using our three cases study, results are demonstrated.