Reliability of Lie Detector Test Results

Lie detector test is designed to detect lies in a particular person and lie detectors have been in use for decades already.  They have been used in their primitive forms for years. For example, ancient Hindus can determine if someone is telling the truth or not by asking the person to spit out rice on to a leaf.  If the person did this successfully, it was a sign that the person was telling the truth.  If the rice got stuck in the mouth of the subject, then he was adjudged as lying.

The dryness of the mouth goes a long way to determine how successful the subject will be.  If the person is lying, his mouth would be dry and he will find it difficult to spit the rice on to the leaf successfully.

The first form of lie detector was developed in the nineteen century by Cesare Lombroso, an Italian criminologist.  This first form of lie detector works by measuring the blood pressure and pulse of the subject. A modern polygraph was later developed in 1921 by William M. Martson, a Harvard student.  The lie detector has been improved over the years and the current ones being used today are far more improved than what obtained in the past.

The U.S. Congress passed the Federal Employee Polygraph Protection Act in 1988. The Act prevented companies from forcing their employees to take the lie detector test before being considered for employment. However, the law does not forbid contractors and government employees, as well as, those who work in public schools, prisons or libraries.  The hiring process for government workers includes polygraph.  You can visit to learn more about lie detectors and how they work.

Despite the popularity of lie detectors, they are considered as being unreliable, which is why lie detector test results are not acceptable as evidences in the court of law.  Many of the professional criminals around have mastered the art of beating the lie detector. Many off the criminals have a way of slowing down their breathing and heart rate when telling a lie. On the flip side, honest individuals may be terrified or scared while telling the truth and the lie detector machine will wrongfully record their words as lies. The points above make the lie detector test results unreliable. Be that as it may, lie detectors are being improved on a regular basis and there are indications that better products will come to the fore in the future capable of detecting when someone is telling the truth or telling lies.

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