I’ve always been curious who will volunteer to do the door-knocking? Nigerians?
Any cop. This actually occurred in NYC under David Dinkins - a little 0bama. Semi-auts were registered in 1967 and then confiscated them in 1992. The NYC police were the ones enforcing the confiscations. People don't join the police to not enforce laws. I know there is a mouthy police worshipping contingent on fr who thinks that they walk on water, but it just ain't so. They enforce the will of the government the DO NOT uphold the constitution.