I think the case should hinge on whether there was a bona fide immediate danger life or limb, which, in his absence doesn't seem to be. The police's duty to return the guns is a different question and the Doctor's statement seems to be against them. If the wife took out an "Order of Protection", under "Lautenberg", he wouldn't pass a background check. I didn't see that in the case. I am not a Lawyer and never played one on TV.
Mike