Between Paul Ekman's work in behavioral science and detecting a persons pulse rate from video (http://www.youtube.com/watch?v=ONZcjs1Pjmk http://www.youtube.com

Between Paul Ekman's work in behavioral science and detecting a persons pulse rate from video (http://www.youtube.com/watch?v=ONZcjs1Pjmk http://www.youtube.com/watch?v=ONZcjs1Pjmk), it seems like one could have a pretty decent "lie detector" running on a smart phone.