Micro stampinig politicians, LOL! I think Macro stamping would be better. Maybe branding across the forehead?
Just the kind of feel good legislation that does nothing to deter crime.
The issue with "Ballistic Fingerprinting" is the marks left on the case and bullet will change with time. As the gun wears in (or out) the characteristics will change. One could easily burr up the barrel with a rat tail file after comitting a crime or use fire lapping after the bullet is entered into the data base.