When flying they can't stop you because of how you look - that would be racial profiling. However they can hear your thoughts! "The aim of one company that blends high technology and behavioral psychology is hinted at in its name, WeCU..." The idea is that it judges your reaction to particular images shown on a screen. Field testing could begin in 2011.
Jim Harper with the Cato Institute, a libertarian think tank, makes the point that if security was left up to the airlines, there would be a mix of security approaches, thus making it harder for terrorists to anticipate. Just like everything else, when the government gets involved, bad things happen.