Even so, you cannot say that the polygraph does not fulfill its function, can it? After all, even in the worst case scenario, 65% is still a very high hit rate.
The result can be forged
Furthermore, the results of the polygraph can be falsified. For example, one of the most common ways of faking is to pretend, it is to increase the excitement when speaking honest answers. That is, by doing this, you will make it even more difficult to detect arousal when speaking a lie.Because of this, some examiners end up not 100% trusting the results of lie detectors.
- The scientific community has even carried out a systematic assessment of the polygraph’s credibility. In the end, they concluded that the test does not really have much scientific validity. This, incidentally, caused the US Supreme Court in 1998 to restrict the use of the detector in court cases.
- From then on, defense lawyers were no longer able to use a lie detector to acquit a client. The use of lie detector in job interviews also declined sharply after that study.
Is the polygraph really reliable?
As you may have noticed, the lie detector doesn’t have much credibility. Even in court cases, the results of the polygraph test are inadmissible, at least here in UK,because, these tests can end up incriminating a person unfairly. You can also now go through the Lie detector test uk and have the proper results.
After all, it is very rudimentary to trust physical factors of the human being, such as sweating, pulse and decreased saliva to decipher whether or not the person is lying. After all, the very situation of being in question can cause stress to the interviewee.
Also known as a truth machine or polygraph, it is a particular type of measuring instrument used to record physiological responses. It records the variations in blood pressure, heart rate, respiratory rate and the galvanic response or skin conductance, which are generated when certain questions are asked of the subject under test.
It also has the ability to measure parameters such as the movement of the questioned, in order to avoid possible countermeasures during the interrogation.
Proponents of the polygraph claim that the biochemical substrate of emotions is directly correlated with body reactivity; that the linearity stimulus → thought → emotion → anatomophysiological adaptation → response is a cycle that invariably occurs in any human behavioral process ; that it is possible to measure the bodily reactions of emotions; and that for each emotional state, there is a well-defined psychophysiological spectrum linked to the emotional activity of the subject.
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The discordance of the data emission content and its correlation with alternate thoughts in their emotional evocation, cause the variation of the organic constants. The measures of this dissonance are valued in the polygraph tests. It is clear that the conceptualization of lies is different for each subject and the basal levels are individual and differentiated, but the emotional tension caused by self-knowledge of the truth ostensibly modifies the organic progression of a person who deceives about a specific aspect.