The Indiana State Police Polygraph Unit is now accredited. The unit was accredited by the Polygraph Law Enforcement Accreditation (PLEA).
A polygraph unit monitors and records readings of the Sympathetic and Parasympathetic Nervous Systems when a person is asked a series of carefully designed questions while attached to the unit. The person taking the test is asked questions where they only answer yes or no. The examiner can determine if the person is giving a true statement by reviewing the readings.
