How are they carried out?
Lie Detecting is used around the world, in countries such as Japan, Russia and China, and the technology remains much the same.
The test will begin with a pre-test interview that can last up to an hour, this introduces the examinee to the process, the questions to be asked and the examiner collects all necessary information about the examinee. There are never any surprise questions as they may in fact trigger a response. What is going to be asked is known.
The equipment is then attached, and it usually includes either a headset with microphone or a blood pressure monitor, electrodes which are placed on an index finger, and two tubes which are wrapped around the chest and stomach. The individual may also sit on a movement sensor pad. The examiner will ask several control questions during the test which have all been presented to the examinee earlier. And then compare those responses to the responses of the questions relevant to the issue.