Here’s how it would work: Passengers would step up to the kiosk and be asked a series of questions such as, « Do you have fruits or vegetables in your luggage? » or « Are you carrying any weapons with you? » Eye-detection software and motion and pressure sensors would monitor the passengers as they answer the questions, looking for tell-tale physiological signs of lying or discomfort. The kiosk would also ask a series of innocuous questions to establish baseline measurements so people are just nervous about flying, for example, wouldn’t be unduly singled out.

Source : The lie-detecting security kiosk of the future