My biggest problem with profiling and ID cards is that they are all backward-looking. They want to know who you are, and what you've done.
This is not much use if the problem is what you're about to do...
Patty Hearst and Timothy McVeight could both have sailed through background checks...
And one Mr. Ames regularly went through *very* intense scrutiny, which completely failed to spot that he wasn't entirely worthy of his security clearance.
Malc.