POLYGRAPH/LIE-DETECTOR TEST


1) How is the Polygraph Examination conducted?

A Polygraph (popularly referred to as a Lie-Detector) is an instrument that measures and records physiological changes caused by the sympathetic nervous system, while the subject is asked a series of questions for which he has to answer “yes” or “no”, wherein deliberate lying produces bodily reactions reflected in blood pressure, respiration (breath rate), skin sensitivity etc. measured through the couplings made to the body of the person.

2) How accurate is a Polygraph?

The Polygraph has been proven to be 98% accurate in the tests so far conducted.

3) How long does it take to administer a Polygraph test?

It usually takes from 2 to 3 hours to administer a Polygraph test for each individual.

4) In Polygraph/ Lie-Detector test is the subject administered a drug through injection?

No, Polygraph test is a physiological test of psychological conditions of the person which are measured through a) blood pressure b) breath/respiration rate c) skin conductivity by attaching rubber/plastic cuffs to the forearm, chest and fingers just as in case of blood pressure test or ECG test.

5) Does Polygraph Examination require the consent of the person to be examined?

Yes. Nobody can undergo the test without their willingness.

6) In what types of cases can Polygraph Examination prove useful?

Psychological screening of suspects in frauds, thefts, abuse, harassment, dishonesty, infidelity, rape, murder, threat or any other white collar crime can be undertaken using Polygraph test.

7) Does high blood pressure affect the accuracy of the Polygraph test?

No. While blood pressure is one of the physiological reactions measured, it does not affect the accuracy of the test. However, prior to examination, it is necessary to ensure medical fitness of the subject.

8) Does the emotional state of the person interfere the Polygraph Analysis?

Yes. The person undergoing the test should be in a calm and healthy condition.

9) Who should NOT take a Polygraph test?

a. Anyone who is being forced to take it.
b. Any person with a serious heart condition, unless his doctor has given written approval.
c. A pregnant women, unless her doctor has given written approval.
d. Any person who is determined to be mentally incompetent or any person who has a respiratory illness or cold and/or any person who has nerve damage or paralysis.
e. Any person who has had a stroke or is an epileptic.
f. Any person who is in pain (i.e., toothache, headache or a recent injury).

10) Is the Polygraph test conducted at all branches of Truth Labs?

No. Polygraph examination is currently undertaken at Delhi office of Truth Labs. However, in important cases tests can be organized anywhere in India.