There may be many ways to help solve the problem, finger print is an example.

But what about an intruder breaking the door down, you may not have the time to put on a bracelet, etc.

And the real problem is that the criminals are not going to follow the new technology, so the good guys are at a disadvantage, wow, don't like that.

Maybe greater penalties for parents that are careless and a child gets a hand gun and doesn't know how dangerous it is. Put the responsibility oin the parents where it belongs.