What if police and military weapons were to be exempted from the requirement?
A law like that would never happen.
A law like that might already exist. I do know there are places that ALREADY had laws mandating the "smart gun" when they become available.
A while back I recall discussions on the forum about one such being sold in CA. There were ...issues. Haven't heard anything lately.
EXPECT police to be exempted, #1, they are going to fight like hell to keep from being put at risk by
experimental technology, and #2, they aren't going to be at any greater risk of responsibility than they are now, even if all of us are required to use smart guns.
"Smart Gun" is a sound byte, for a gun that will only fire for an authorized user. Generally expected to use some kind of computer system for recognition. So far, a bracelet, or watch with the authorization that needs to be worn has been tried. I don't know about one that reads fingerprints, but the problems with that should be obvious.
One poster related how he had personal experience that you couldn't dial 911 on a touch screen phone when it was covered in blood. With all the possible situations where a handgun HAS to work, no matter what, so far, nothing has proven acceptably reliable.
One attempt appeared to work well enough, using a watch but it was only in .22, as larger calibers recoil broke the system.
Also, in general consider this, no matter what kind of "smart gun" system they invent, there will be a (probably) simple way to disable it. And the bad guys will figure out what that is pretty quickly, even if the news media doesn't help them.