All our Polygraph Examinations undergo a control check by a qualified Polygraphist to ensure that the test is valid and the results are accurate. All our tests are being saved on a Data Base and kept for a period of three years, should any dispute arise in disciplinary hearings / CCMA cases. A consent form is signed by each examinee whereby he/she agrees to be Polygraph tested. All our Polygraph Exams and Interviews are being Video Recorded and kept on file for a period of three years for future evidence, should any dispute arise. A written statement is obtained during confessions.
The modern Polygraph instrument can monitor and record up to five measures: 1) Respiration,
2) Electro dermal activity,
3) Cardio changes,
4) Relative changes in the total blood volume using the (Photo Plethysmograph) and
5) Movement to detect certain physical countermeasures.
The Polygraph instrument merely records momentary changes in a person’s level of physiological arousal.
There is no lie response per se. That is, there is no unique response pattern which occurs every time a person lies, and never under any other circumstance.
Many things cause the body to respond; noise, sights, being touched, telling a lie, even random
thoughts. The examiner must structure the testing situation to eliminate or control extraneous
sources of reactions. For example, repeating the test questions several times controls responses
to random thoughts.
Global Polygraph Services Polygraphist Johan Terblanche has completed his Forensic Psychophysiology courses in 2001 and has done more than 10 000 polygraph test in over the period of 10 years with several Advanced Courses in Forensic Psychophysiology and we make sure that all our members undergo Advanced Training every year to keep up to date with the latest Research and Techniques regarding Forensic Psychophysiology and Interviewing as well as Body Language. We have many years experience in Polygraph and Investigation.
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