The simplest way to obtain evidence in court and determining the character of employees who are employed and potential ones is through the lie detector test. Generally, most people do not view the lie detector test as one of the best ways of getting information from people. On the other hand, there are those in favor of the lie detector test as it helps to easily know whether someone is lying or not. Most professionals in science prefer the term polygraph than lie detector test.
Polygraphs work in such a way that it is quite easier to figure out whether someone’s saying the truth through measuring different levels of the body.
The person judging is able to look at the reaction of body when the person is answering questions and thus able to determine if the subject is engaging in truthfulness.
The machine, once an analog machine, has now changed over the years to be a digital one.
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The polygraph detector is able to check out the respiratory rate, heart rate, and the amount of perspiration through the finger-tips of the person being questioned. Next, the examiner will begin to evaluate the test of the test and study any difference in the results of the behavior.
The detector machine’s wires and tubes are closely places on the subject in question. The professional examiner will immediately get to know the version of the story of the subject at hand. In this stage of the process, the lie detector is not used. Observation and monitoring by the examiner is done in this stage. Afterwards, the examiner sets questions for the subject to answer. In fact, the lie detector is able to test about 60-70% on questions that will allow the user to answer yes or no. Frankly, the test follows suit in the case of an exact science and is much appreciated by many who are well trained in the process.
Many people suggest that the people who conduct the interview should take into account their subjects cultural background, religious beliefs etc.
Many argue against the lie detector stating that there are both false positives and negatives with the test. For example, a false positive is where someone tells the truth, but it reads as a lie and a false negative is where someone lies but it tells it as the truth. People say that there’s a way to beat the machine by doing something like biting their lip each time a query is asked.
Many believe that the polygraph shows inconsistent answers. Well, become an examiner is not hard though the state you are determines whether you’re going to be trained or just be an examiner straightaway.