Polygraph Testing Basics
A polygraph – aka a lie detector - is an instrument that measures and records several physiological responses such as blood pressure, pulse, respiration, breathing rhythms, body temperature and skin conductivity while the subject is asked and answers a series of questions, on the theory that false answers will produce distinctive measurements. The polygraph measures physiological changes caused by the sympathetic nervous system during questioning. Polygraph testing has an extremely high success rate and accuracy, and is very effective to resolve typical crimes like theft and fraud.
Polygraph testing is highly accurate. The American Polygraph Association has conducted over 250 studies on the accuracy of polygraph testing during the past 25 years. Recent research reveals that the accuracy of the new computerized polygraph system is close to 100%. Polygraph Inquiries
of South Africa has in its history not encountered any cases which could not be solved using polygraph testing, with a near perfect success rate across all criminal activities.