Replies

Among other things the Israelis use a computer screen at the check in desk with questions on it in Arabic or the language of the aspiring passenger. The passenger is asked to look at the screen. He doesn't have to read aloud or answer the questions. A camera/sensor records changes in the pupils of his eyes. If he reads, "are you planning to hijack the airplane?" and his intention is just that then his pupils will change. There are several such questions. Security personnel will attend to him immediately. They say it is 100%.
The USA refuses to adopt that system because it would remove the excuse for the existence of the kenyan praetorian guard/KGB that is the TSA. It is also a sort of profiling that discriminates against Moslems.