A polygraph records respiration, cardiovascular activity and electro dermal activity of an examinee while an examiner questions him/her. The examiner will then analyze the charts and render an opinion as to the truthfulness of the person taking the test. We are able to arrange for polygraph testing to be carried out on-site or off-site by expertly trained and internationally accredited examiners.
What can a polygraph be used for?
What does a polygraph examination entail?
A Polygraph Examination consists of three separate and distinct phases:
- Pre-test Phase
- During the pre-test phase, the Polygraphist (Polygraph Examiner) will explain your legal rights and the voluntary nature of the examination. Also discussed is your medical, physical, and psychological background as well as your knowledge of the investigation and an explanation on how the instrument works.
- Testing Phase
- At this point the Polygraphist will review all the pertinent test questions with you and then conduct a Demonstration Test to help them assess your suitability for additional tests. Several tests will then be conducted which will include the reviewed questions. There will be no surprise questions on any tests. The Polygraph Examiner will then analyze the results of each test to arrive at an opinion.
- Post-test Phase
- During the post-test phase, the Polygraphist will discuss the results of the In-Test and provide you with their opinion.
How does it work?
A polygraph instrument will collect physiological data from at least three systems in the human body. Convoluted rubber tubes that are placed over the subject's chest and abdominal area will record respiratory activity. Two small metal plates, attached to the fingers, will record sweat gland activity / skin conductivity, and a blood pressure cuff, or similar device will record cardiovascular activity. In addition, activity sensors in the examination chair can be used to detect and measure subtle and gross movements.