Article on Truth Detection Methods: Legality and Scientific ...

Lie Detector: the lie detector or polygraph test is an examination, which is conducted on the assumption that the body undergoes certain physical changes when under stress. The heart beat increases; blood pressure goes ... A baseline for these physiological characteristics is established by asking the subject questions whose answers the investigators know. Deviation from the baseline for truthfulness is taken as a sign for lie. It is conducted by attaching various probes ...