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You may have seen the demonstration of lie detectors in movies. These devices are used in order to extract the truth from the lying witnesses. The wire of the devices makes a relationship between the lie detector and the person being tested. The machine draws lines on the newspaper to help the professional determine if the man is lying or telling the truth.

According to the most recent studies, the truth of a lie detector varies between 70% and 95%. Let’s now have a look at some of the benefits provided by this machine.

Benefits and Utilization

Since lie detector tests are rather popular, a growing number of people are beginning to use them. Nowadays, they are being used for social research projects.

Often, lie detectors can have an influence on the way the subject gives answers to the questions. While they aren’t used solely to find out the truth, they do assist record changes in the physiological indices of this subject. So, the experiments are done in combination with before and after interview tests.

It’s important to be aware that some companies also use polygraph tests. The tests are done in order to screen prospective personnel.

Another common use of the devices involves the evaluation of the statements given by the witnesses and suspects. Moreover, law enforcement agencies also use them to monitor the post-conviction offenders. However, it’s important to note that the machines are not used to determine whether the subject is truly guilty.

It’s interesting to note that toy lie detectors are also quite popular among kids. Interestingly enough, these toys are based on similar algorithm and may give a mild electrical shock to the subject if he tells a lie. However, it is important to remember that the results may not be accurate.

Negative Remarks

Polygraph tests are very popular, but the results of these tests can not be accurate. The reason is that not everyone will give the same reaction in a situation. As a result, the physiological indices of a individual may be different from another test subject. That’s the main reason this device is not considered 100% reliable.

Also, polygraph tests are not worth it. The machine may give misleading results. While the authorities will be busy demonstrating that the subject is guilty, the real culprit may go out of the reach. Because of this, they have to perform the exam all over again, which will have a good deal of extra time.

Additionally, the tests can cost a great deal of money. Apart from the price tag of this machine, it is going to cost additional money to hire a qualified professional for the interpretation of the test results.