The Pros And Cons Of Using A Lie Detector Test

Pro: How Polygraph Tests Are Useful?

The accuracy of a polygraph test, when carried out by a qualified and certified examiner, can be between 75% and 95%. In many situations such as infidelity questions or employee checks 75% is enough and many people have been able to get their lives on track or have been employed on the back of a good result from a polygraph test.

 The Pros And Cons Of Using A Lie Detector Test

Con: What Are The Problems With Polygraph Examinations?

They are not reliable and they do not tell the examiner whether the subject is telling the truth or lying as they can only indicate a lie based on the physiological reactions to the questions asked. The examiner can be swayed by the individual’s physiology or he could be bias. Some people are very nervous while others are unshakable. Some people can control their physical reactions which all makes for a less reliable result.

Pro: Pre-test And Post-test Interviews

Some sources state that if a pre-test and post-test interview are carried out then the lie detector test examiner can tell what sort of signals are being picked up when an individual is nervous or lying during the exam. Some employers are not looking to see if individuals are lying or dishonest, they use the polygraph to see if someone can give a straight answer to a clear and concise statement. Under the extra pressure of the lie detector test the candidate is less likely to extravagate or stretch the truth.

Con: Will It Damage The Trust?

Polygraph tests are used to test whether an employer can trust an employee but these tests can damage the trust an employee has with an employer. Even if an employee passes a polygraph test, the fact that he was asked to do the test can cause great resentment, discomfort and anger. Employees sometimes feel their employers do not trust them. This can make employees decrease their performance and overall production.

Pro: Helps To Keep Company Honest

If the use of polygraphs is specifically stated in a company’s policies as part of an anti-theft program, the idea may help to stop the temptation or the dishonest behaviour among employees. Because workers know they can be subject to a lie detector test, they’re more inclined to be honest at all times. New employees should be told that lie detector tests are a real possibility and often asked to be taken, so if they chose to take the job, the use of the tests should not impact their morale.

Con: Waste Of Valuable Time

A polygraph text may produce a mixed result. An honest employee may have failed answers to the test because she was afraid of the test and her physical reactions to the fear were misread by the machine. The company could waste time on a false investigation and wrongly accuse an honest person of misconduct as a result of false positives on the test. False accusations can damage moral and give the employee a right to take the employer to court.

Charlie Hodgson has worked with private detectives as a private investigator. During his many years of experience working on investigations and carrying out detective work he has witnessed the need for numerous polygraph tests. Having worked alongside many highly trained polygraph examiners he has gained the knowledge of how the polygraph machine works and the expert way the examiner carries out the test. For more information like this blog please visit

Author: Tech Poster

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