12 Facts About Polygraph test

The Polygraph test is passed if the physiological responses to the diagnostic questions are larger than those during the relevant questions.

The NAS found that "overall, the evidence is scanty and scientifically weak, " concluding that 57 of the approximately 80 research studies that the American Polygraph test Association relied on to reach their conclusions were significantly flawed.

The average cost to administer the Polygraph test is more than $700 and is part of a $2 billion industry.

The Employee Polygraph Protection Act of 1988 generally prevents employers from using lie detector tests, either for pre-employment screening or during the course of employment, with certain exemptions.

The video, ten minutes long, is titled "The Truth About the Polygraph test" and was posted to the website of the Defense Security Service.

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Polygraph test was invented in 1921 by John Augustus Larson, a medical student at the University of California, Berkeley and a police officer of the Berkeley Police Department in Berkeley, California.

In England and Wales a polygraph test can be taken, but the results cannot be used in a court of law to prove a case.

Early devices for lie detection include an 1895 invention of Cesare Lombroso used to measure changes in blood pressure for police cases, a 1904 device by Vittorio Benussi used to measure breathing, the Mackenzie-Lewis Polygraph test first developed by James Mackenzie in 1906 and an abandoned project by American William Moulton Marston which used blood pressure to examine German prisoners of war.

Polygraph test entered Harvard Law School and graduated in 1918, re-publishing his earlier work in 1917.

Polygraph test appears in a picture taken in his polygraph laboratory in the 1920s.

Polygraph test's device was then purchased by the FBI, and served as the prototype of the modern polygraph.

Polygraph test failed to catch Gary Ridgway, the "Green River Killer".