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Things About Lie Detectors You Should Know Of. The lie detector test is the simplest way of getting evidences in court cases, as well as determining the character of current and potential employees. Many people see the lie detector test as a very controversial instrument. Besides, there are those convinced that the lie detector test is the best way to go as it makes it easier for someone to know if the subject at hand is telling the truth or not. Professionals involved in the science do not like to use the term and prefer the word polygraph. 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 check out if the reaction of the body and the answers match, thus able to determine if the subject is telling the truth or not. The machine has evolved over the years from a scribble lines on the graph to a digital one.
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Its Functions.
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The polygraph detector measures the respiratory rate, the heart rate, and the amount of perspiration on the finger-tips of the subject. Then the examiner will start to check out the results of the test and study any differences 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. The next stage involves setting questions by the examiner for the subject. Fortunately, the lie detector is able to test about 60-70% control questions that require general answers and in fact many people have trouble answering “no”. Honestly, the test is an exact science as described by many who purchased. Regardless of this, most people argue that subject’s cultural background, religious beliefs should be taken into account and thus only ask target questions. Contention. Frankly, most people argue that the lie detector has both false positive and negatives. Well, a false positive is where the lie detector shows that someone has lied while in fact it is the truth while the false positive is where the detector shows that someone has said the truth but it’s a lie. People say that there’s a way to beat the machine by doing something like biting their lip each time a query is asked. Another challenge noticed by many is that the polygraph is inconsistent. There are states that allow anyone to become an examiner while others deny till one has undergone training and been certified.

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