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Polygraph is a device commonly used by law enforcement agencies for:1. launching tear gas shells2. lie detection3. firing pellets4. throwing water with high pressure

Answer» 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.


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