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Criminal Specific-Issue Examinations
Law enforcement is the largest user of the polygraph, where it is mainstay of criminal investigation. Typically, a small number of suspects will be identified by traditional police work, and the polygraph is brought in to determine which of the suspects committed the crime. Or, a single suspect will come to the attention of police, and the polygraph is used to help decide whether to focus on the individual or to look for new suspects. Unlike some other types of polygraph testing, criminal specific-issue examinations use test questions that are tightly focused, with perhaps a few technical questions that aid in the analysis of the charts. Examinees are told the test questions before the testing begins, and their results at the end of the examination. If they pass the testing they are thanked for their time and released. If the examinee fails the test, he or she may be questioned further by the police. Sometimes this questioning leads to more testing, but frequently deceptive examinees will acknowledge having committed the crime once they recognize that they have been caught by the polygraph.
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