Polygraph, Glossary and Terms, Attorney's office, Personal Lawyer
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More commonly known as a lie detector, it is a device designed to measure physiological responses resulting from specific questions being asked of the subject. The theory being that when one lies the body reacts by increasing breath and heart rate. While polygraphs are not allowed as evidence of guilt or innocence in a court of law, law enforcement and prosecutors have been known to rely on them heavily in determining whether to pursue a defendant.