What is a Polygraph?
The polygraph is a scientific, diagnostic instrument used to measure the physiological response of an examinee under controlled conditions. These physiological changes--breathing, blood pressure, pulse rate and amplitude, and the galvanic skin reflex--are the phenomena with which the polygraph examiner concerns himself.
Basic Uses of the Polygraph
The polygraph should be a supplement to, not a substitute for, a thorough investigation. The effectiveness of the polygraph examination, to a large extent, will be based upon the thoroughness of the investigation, prior to having the person take the examination. To maximize the effectiveness of the polygraph examination, the persons involved in developing and/or presenting the case information should work together as a team. Polygraph is very useful in private investigations. Polygraph can assess aspects of cases that is usually not available through other means of detection.
The Clinical Use of Polygraph in Treatment: The polygraph is an effective intervention for eliciting admissions regarding behaviors that no other process seems to elicit. These admissions are crucial to break down denial, facilitate client accountability, and promote change in the therapeutic process. The implementation of sanctions and privileges is expected to encourage clients to continue disclosing their high risk behaviors (Almeyer, Heil, Mckee, and English 2000).
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