Advantages of Using Polygraph

Polygraphs may be granted to employees only when their work has direct effect on subject area security or dry land safety. Companies may yet recitation polygraphs in on-going investigations with some restrictions--the business must be subject economic loss or injury, and there must be reasonable doubt to give the test. While it seems clear that many businesses would like to rely on polygraphs, the law recognizes that polygraph tests are not very reliable (Frierson 84-88).

The polygraph is popularly called the craft detector, but it does not really detect lies at all but quite an gauges physical responses on the part of the soul taking the test. The polygraph is not seen as a reliable method for evaluating the honesty of an individual's statements. The polygraph was invented earlyish in this century and has since been used in different types of investigations and for forcefulness screening. It works on the principle that state a lie causes a reproducible and detectable physiological reaction. Telling a lie in theory stimulates the autonomic nervous strategy and causes changes in involuntary processes such as roue pressure, pulse, ventilating system patterns, and perspiration. Those who believe in the validity of the test believe that polygraph results are

as reliable as those of otherwise diagnostic tests, such as the electrocardiogram, while others believe that other factors may affect the validity of the test results. Some individuals who change testing may experience complex emotions that affect their autonomic nervous system, thus changing the test results, while still other people are able to escape spying by tensing their muscles or using certain drugs. For these reasons, most state and federal courts restrict the use of polygraph test results or do not allow their use at all (Steinbrook 122-123).

Iacono, William G., Anna M. Cerri, Christopher J. Patrick, and Jonathan A.E. Fleming. " spend of antianxiety drugs as countermeasures in the detection of guilty knowledge." Journal of use Psychology (February 1992), 60-64.

There are three ways by which the lie detector measures autonomic responses. The first is by electrodes on the hand that measure the ability of the skin to conduct a weak electric current, which in turn is a amour of sweating. Second, two straps around the chest measure the depth of airing. third, a partially inflated cuff on the arm measures kind pressure and pulse. The theory is that when people lie, the skin conductance increases, breaths become shallow, and blood pressure rises. these variables are not equally significant, so the quizzer must weigh the totality of physiological evidence to arrive at a conclusion. A computer program used by some polygraphers gives skin conductance 70 percent of the final score, respiration 20 percent, and blood pressure 10 percent. The test is not seen as reliable by critics because some people entirely do not give the accepted responses when they lie. A person who lies all the time can be either super nervous or extremely calm, and for that matter someone who is telling the truth can be very nervous because of the impressiveness of the consequences. Proponents state that the polygraph is effective because it does not measure universal
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