Smart guns?

Good post on smart guns over at Tam's.

But if you look at a firearm as a piece of emergency equipment, then Authorized User technology is a no-go. A cop's partner may need to use her gun; my roommate may need to use mine. It needs to work right the first time, every time. It cannot malfunction or, if it does so, it must "fail-dangerous", in such a way as to leave me the ability to use the gun to defend myself, even if the Authorized User function no longer works.