Both well proven and accepted today, the scientific basis for Polygraph testing is well documented with upwards of a 95% confidence rate.

Lie detector testing can take the form of either diagnostic or screening tests, depending on the existence of a known problem, or the absence of a known incident.

Polygraphs measure the uncertainty around a conclusion based on differences in responses from different types of stimulations and are used to determine deception. Examinees react to either the relevant or comparison questions; the difference between these two categories of questions giving rise to data with which a determination can be made.