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The polygraph technique is very accurate, however, it is not infallible. According to the American Polygraph Association, over 250 studies have been conducted over the past twenty five years on the accuracy of polygraph testing. It is estimated that the accuracy of the results is in the range of 90 – 95 %. More recently, research has shown that the accuracy of computerised polygraph testing is 98 %.
Yes. The polygraph instrument is a scientific, diagnostic instrument which is often called the “lie detector”. It would be more appropriate, however, to call it the “truth verifier”.
It is quite normal for an innocent person to feel nervous and the polygrapher is very aware of this. Nervous reactions which are recorded on the polygraphic charts are not interpreted by the polygrapher as a manifestation of deception. Nervous reactions are completely different from those reactions that are recorded when a person is deliberately lying.
Yes. With a BEPA examiner you will be informed of the exact wording of each question that will be asked of you during the course of the polygraph examination. There will be no “trick” questions.
A polygraph examination takes about two to three hours, however, some may take more or less time, depending on the nature of the issue under investigation.
The examiner should give a detailed explanation of the polygraph procedure, how the polygraph works, and he will answer any questions that the examinee may have. The examiner will also inform and discuss the result of the examinee’s polygraph examination.
BEPA examiners can carry out tests in any language via a team of highly skilled linguistic experts available to us.