I agree with Hk. I am entering Law Enforcement, and many LE officers I speak with are very pro-second. I believe that in a SHTF scenario like you speak about (And I consider confiscating all weapons a SHTF scenario) that many police officers would simply refuse to enforce the laws or resign. I know I would.
But perhaps I am idealistic. I will see how I like LE after I have been in it for awhile.
Fixed some spelling