How accurate is polygraph testing?

Answer An investigation into the accuracy and utility of post-conviction polygraph testing of sex offenders, completed in 2006 at St. Nicholas Hospital in Gosforth, England, revealed that the polygraph te... Read More »

Top Q&A For: How accurate is polygraph testing

Who invented the polygraph test?

The polygraph machine was developed in 1921 by psychiatrist Dr. John A. Larson. Larson's machine was the first to measure blood pressure, respiration and pulse. The same year, Dr. Leonard Keeler,... Read More »

How to Cheat a Polygraph Test (Lie Detector)?

A U.S. patent sketch of a polygraph machine at work. The needles chart physiological changes, such as breathing and heart rate, over time. While this sort of machine is still frequently used, compu... Read More »

Is a polygraph test admissible in court?

The United States Supreme Court has not ruled on the admissibility of polygraph test results and there is little consistency among courts on this issue. Court rulings have ranged from absolute bans... Read More »

How to Know If You Passed a Polygraph Test?

A polygraph exam, regardless of the purpose, is a physiological measurement tool used to determine truthfulness or deception. The examinee is connected to the polygraph machine in a way that heart ... Read More »