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Understanding Lie Detector Tests To apply for a job in government organizations like the CIA or the FBI you will first need to pass a lie detector (polygraph) test. You may also have to undergo such a test when involved in some kind of police investigations. The machine/polygraph used for this test measures the person’s physiological indices like breathing rate, pulse, perspiration and blood pressure. The notion of this test is that someone who lies or gives deceptive answers will produce physiological responses that can be differentiated from those when one gives the true or non-deceptive answers. The person be tested is attached with about 4-6 sensors. The machine then records the several signals that are intercepted by these sensors on a “graph”. That is however not all about lie detector tests. To begin the test the tester will do a pre-test interview that focuses on get some info that will be used as the basis for the diagnostic questions to be asked later. The subject is the informed on how the machine functions and they are emphasized upon to always give the true answers. The tester usually then asks the subject to intentionally lie. The examiner then reports of the machine having detecting the lie just told.
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This twist and turn will make a guilty subject become anxious as they are reminded of the lie detection test’s authenticity. It is only then that the real test then starts. Usually there are 3 types of questions that are asked namely “irrelevant” (IR) questions, “diagnostic” questions and “relevant questions” (RQ). ) He will also ask “diagnostic” questions and “relevant questions” (RQ). An irrelevant question may be like “Is your name George”? The relevant questions or simply RQ are however the ones the tester is interested in.
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The subject will have passed the test if their physiological responses to the diagnostic questions are larger than their responses during the relevant questions (RQ). This method is generally known as the CQT (Control Question Technique). Another alternative technique is the Guilty Knowledge Test (GKT) or Concealed Information Test (CIT). This technique is used to prevent errors that may come from the questioning style. Here the tester/examiner has no prior knowledge of the crime done or the circumstances. The subject is rated as per the reaction to the correct answer among the multiple questions choices. A strong reaction to the guilty info proves the likelihood of them knowing facts to the case. Several people have in the past given their doubts about lie detector tests. One thing for sure though is that these tests have been applied in a number of situations.