How does the polygraph work?
The polygraph uses two rubber vacuum or sealed tubes to record respiratory activity. One tube is placed above the heart and one below the heart. Two small metal plates are also attached to the examinee’s fingers in order to monitor and record activity caused by sweat glands. A blood pressure cuff placed on the examinee’s arm will record the cardiovascular activity. A counter measure cushion should also be placed under the examinee’s buttocks to detect any attempts by the examinee to use counter measures during the testing period. All polygraph tests should be videoed and voice recorded for the protection of the examinee.
Will my medication have an effect on my test?
If you are taking maintenance medication make sure you take the prescribed medication on the day of the test. All examiners want your physical reactions to be normal. Not taking your medication could have an effect. Always let your examiner know what type of medication you are taking. The examiner should ask anyway.
Will I be asked surprise questions?
No, every question will be discussed with you word for word prior to the examination. You will actually help the examiner formulate the questions. The examiner is here to help you prove you are telling the truth. If you have trouble in any way with the questions be sure to tell the examiner. Every attempt will be made to insure that you know and understand each question. Each question can and will be modified to insure that you no longer have troubles or concerns with the questions.
What does a polygraph examination cost?
The cost of the test varies with the type of examination needed. The type of test and the anticipated results should be discussed thoroughly with your examiner who can then provide the fee that will be charged.
Wouldn’t a Voice Stress Test be just as effective to show a person is being untruthful?
No, scientific studies conducted by the Department of Defense on voice stress concluded that the results of voice stress are mere chance and are therefore considered to be unreliable. (Ref. APA position on voice stress)