First sentence on Wikipedia: >A polygraph, often incorrectly referred to as a lie detector test, is a junk science device or procedure that measures and record

First sentence on Wikipedia: >A polygraph, often incorrectly referred to as a lie detector test, is a junk science device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is asked and answers a series of questions.