At any rate criminals will do what it takes to defeat the system and honest people will have to be very careful to pick up their brass so it can't be planted at a crime scene.
It all boils down to another scheme to make the dumbass liberals feel better, it doesn't have to accomplish anything else. It will get more votes for Bloomberg and Schumer and the other urban statists.
Most liberals are ignorant about guns and ballistics. Most of the press is equally as dumb. They will buy this idea and push it and the liberal politicians will run with it.
Why? The gun danged sure isn't registered to them.
Where does that leave the owner when their gun gets stolen?
It is bad enough that a person might wonder what nefarious use their (former) firearm is being put to, but to possibly face charges because some thief stole their gun and someone used it in a crime really sucks.
This crap needs to be fought tooth and nail (again).