Who invented the polygraph test?

Answer 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 »

Top Q&A For: Who invented the polygraph test

Ways to Beat a Polygraph Test?

First invented in 1917, polygraph machines, or lie-detector tests, measure the involuntary responses of a subject's body to questions asked by an examiner. According to the Electronic Privacy Infor... 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 »

Reasons for Taking a Polygraph Test?

Over time, the polygraph test has lost its value in the American legal system. In fact, the polygraph test has always been a device that was almost entirely unique to the American justice system. N... Read More »