We hear about polygraph’s or, also known as lie detector tests, used in police investigations all the time. Even those who are about to go through a job interview might have to take one to prove they are telling the truth. As well as this, they use lie detector tests or polygraph’s on talk shows to prove whether someone is telling the truth or not. They say that they are at least 99.9% effective and reliable. Take Abir Polygraph’s for example, they are one of the leading Polygraph centers in Israel and are used for both private and business clients. Would you like to know some facts about polygraph tests? Here are some things you might not have known about them.
How the Polygraph Works
There are four to six sensors attached to a person when they go through the test. These sensors record a few different things on a paper graph. The things recorded include the person’s breathing rate, their pulse, their blood pressure, and their perspiration. As well as this, sometimes the polygraph will also record the movements of the legs and arms.
At the beginning of the polygraph, the examiner will ask three or four questions to test their normal signals. After that, the real questions begin. Throughout the test, the polygraph will record the person’s responses to the questions. During and after, the examiner can read the person’s responses to the questions to find out whether they are telling the truth or not. If any of the vital signs change significantly, such as blood pressure, breathing rate, and pulse, this can show that the person is lying.
If an expert examiner is giving the lie detector test, they can tell if the person is lying with high accuracy. However, because different people react to different things, a polygraph can actually be fooled sometimes and someone can pass even when they are lying.
However, police do use lie detectors a lot because they do often have a high accuracy rate.
How Polygraph Tests work for Employee Screening
Polygraph tests can also help screen job applicants and filter the good ones from the bad ones. This way, the employer can ensure they are hiring someone who is truthful, trustworthy, and reliable for the job.