Question

Polygraph is a device commonly used by law enforcement agencies for:
1. launching tear gas shells
2. lie detection
3. firing pellets
4. throwing water with high pressure

Answer 1

Correct Answer - Option 2 : lie detection

The correct answer is lie detection.

• Polygraph is a device commonly used by law enforcement agencies for lie detection.

• It is a device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is asked and answers a series of questions.
• The belief is that the use of the polygraph is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive answers.
• Instruments like cardio-cuffs or sensitive electrodes are attached to the person for the test.
• A numerical value is assigned to each response to conclude whether the person is telling the truth, is deceiving, or is uncertain.