You would have to be insane to contemplate storing biometric data, especially en masse. While only in its infancy biometric data is the holy grail of identity theft. It can't be (easily) changed by a person, and theft is the *least* of your problems.

Consider if a bad guy wanted access and compromised your system. He substitutes his biometrics for X, he's in and nobody the wiser. When he's done, he switches back.

Perfect crime.

Biometrics, a *REALLLY BAD IDEA*. Especially if it becomes widespread.