What is the test for a state to regulate the possession of loaded firearms on government premises?

The task is, as shown in Hubbard, to determine whether the state has occupied a relevant field--an area of legislation which includes the subject of the local legislation, and is sufficiently logically related so that a court or a local legislative body, can detect a patterned approach to the subject. Thus, that the state has legislated concerning the possession of loaded firearms on government premises (e.g., Pen.Code, 171c--171e) indicates no patterned approach to the subject of prohibited users, such as prisoners or exfelons or minors. A field cannot properly consist of statutes unified by a single common noun. (See Markus v. Justice's Court, 117 Cal.App.2d 391, 396--397, 255 P.2d 883 (local licensing of dogs not preempted by state).)