Several people, both in these forums, and in the media, have proposed a screening system similar to that used by El Al, which includes a very thorough questioning, lots of cross-checking to see if an individual's answers contradict themselves, and other checks and procedures.
Several others have stated they want no form of this verison of security. Because to cross check, they have to know personal information, which people have huge issues with (CAPPS2). It's a great system for a single airline but how well would it work with mutliply airlines in one airport?