Sure, in terms of profiling. The unfortunate thing is that up to this point, in most cases profiling does not appear to be terribly effective. It certainly hasn't effectively stopped people such as Richard Reid or the underwear bomber—these sorts of individual.
The other point I would make is that the recent study specifically on biometrics suggests that one of the problems is that over time the biometric can become highly unreliable. In terms of repeat movement over a time period, that's a problem.