FREQUENTLY ASKED QUESTIONS

A polygraph test involves the collection of physiological data when test question stimuli is presented to the examinee, the test data is recorded by making use of a pair of pneumographs, electrodermal plates, a blood pressure cuff and other auxiliary components. The polygraph instrument continuously records physiological changes, allowing the examiner to interpret test data to determine the likelihood of deception or truthfulness.

This answer can be somewhat complex due to the accuracy being dependent on some factors that needs to be taken in consideration, consideration should be given to the type of examination, technique selection and scoring method. To summarise and answer this question with an overview we can say that polygraph tests have been subject to extensive scientific reviews. The accuracy typically falls within a range in the high 80s, extending into the low 90s.

The preparation for a polygraph examination is fairly straight forward, firstly ensure you need to get a good night rest, if you are on any chronic medication make sure you take your medication as directed by your physician. At the time of your test make sure you are clear with your explanations and answers, ensure that you understand what instructions you need to follow.

The short answer is, No. Individuals cannot be forced to undergo polygraph tests, it is however important to note that if this request has been made in a working environment then you ensure that there is not a clause in your employment contract that makes provision for the use of a polygraph examination.

Polygraph examiners must have completed the specialised training program and should have certification thereof, it must also be noted that the examiner should complete advance training seminars on an annual to biannual basis and lastly an examiner should belong to a professional body. It is also important to note that there is a BIG difference between Polygraph and Voice Stress Analysis (VSA), unfortunately a Voice Stress Analysis examiner will indicate that they are polygraph examiners which is a false statement – the accuracy of VSA is lower than chance.