California Code, Penal Code - PEN § 29141

(a) The facility is equipped with a burglar alarm with central monitoring.

(b) All perimeter entries to areas in which firearms are stored other than doors, including windows and skylights, are secured with steel window guards or an audible, silent, or sonic alarm to detect entry.

(c) All perimeter doorways are designed in one of the following ways:

(d) Heating, ventilating, air-conditioning, and service openings are secured with steel bars, metal grating, or an alarm system.

(e) No perimeter metal grates are capable of being entered by any person.

(f) Steel bars used to satisfy the requirements of this section are not capable of being entered by any person.

(g) Perimeter walls of rooms in which firearms are stored are constructed of concrete or at least 10-gauge expanded steel wire mesh utilized along with typical wood frame and drywall construction. If firearms are not stored in a vault, the facility shall use an exterior security-type door along with a high security, single-key deadbolt, or other door that is more secure. All firearms shall be stored in a separate room away from any general living area or work area. Any door to the storage facility shall be locked while unattended.

(h) Perimeter doorways, including the loading dock area, are locked at all times when not attended by paid employees or contracted employees, including security guards.

(i) Except when a firearm is currently being tested, any ammunition on the premises is removed from all manufactured guns and stored in a separate and locked room, cabinet, or box away from the storage area for the firearms. Ammunition may be stored with a weapon only in a locked safe.