That aside, imagine if the cops pick up brass from a crime scene that has been reloaded a few times, or has been picked up from a public range and dropped.
You are going to go after some guy because he was shooting at Sharpshooters in Torrance and someone scooped his brass?
New revolvers are exempt- gee, do you think people will buy revolvers if semis are not as available? Revolvers don’t drop brass unless the shooter wants to.
Barret (makers of .50 cal weapons) did that to IIRC Cali police depts. There was link on the company webpage. I can't link to it...because guns and weapons are naughty pages that my company forbids to view on this computer.