The 1,800 or so criminals who have killed, robbed or assaulted innocent people with guns in the District of Columbia so far this year were hauled into the police station to be fingerprinted, photographed and to undergo a criminal-background check. Now, legal gun owners who have committed no crime are getting the exact same treatment. That is neither constitutional, nor fair. The latest gun-control scheme that starts on Jan. 1 will force every legal firearm owner in the nation’s capital to go in person to police headquarters to renew their registration certificates. The Metropolitan Police Department filed proposed rules last...