at the university of grotz vittorio been to see developed the polygraph it measures respiration and pulse lucy's theory was that if a person is lying excitement would cause heart and respiration rates to change. but lie detector results still aren't considered irrefutable evidence a conventional polygraph wouldn't have unveiled this thief. the measurements are too inaccurate because nervousness can happen in many situations not just during life. the woman isn't a real fifi she's a research subject. from the university of birth board has set up some items at a fake crime scene he wants them to be stolen. he aims to use what's known as the guilty knowledge test to show that breathing pulse heart rate and skin connectivity can be significant. the talk isn't as opposed to e.d.s. the guilty knowledge test is based on the idea that you don't detect the lie itself and so you don't ask a question like did you kill so and so or did you steal the cash box instead you ask about certain details of the crime details that only the perpetrator can know can come. shows these details to the test subject.