Since when has a law stopped a criminal from getting anything. They re criminals, and they will get what they want, by whatever means. Not very likely. It will help police trace weapons used in crime , they say. Now that s a stretch.
Criminals remove serial numbers, among other things.
And besides, what good does it do wasting resources after a crime has been committed. It will help reduce domestic violence , they say. Domestic violence is not dependent on a firearm. Most domestic violence involves the nearest object at hand fists, mostly, and knives, and baseball bats. The tool is not the cause of the crime, but yes, if we look for the precursors of domestic violence, we can reduce the risk of a firearm being used, and that leaves any other weapon of choice.