Polygraph testing is the quickest, most cost effective, accurate and reliable way to verify whether a person is being truthful or not. Polygraph testing is used for pre-employment screening, as a determination of management and staff integrity as well as a specific aid to investigations. Polygraph testing measures 3 bodily activities (breathing, heart rate & sweat activity) where other methods  only use one (for example, vocal cords) making it easier to determine deception.