Razor Wire, Concertina Wire, Cut Glass. Razor wire, concertina wire and/or cut glass shall not be used on the exterior surface of any wall, fence, building, structure, or roof in any zone within the City, unless an exemption has been granted by the Chief of Police, or his or her designee, when such use is deemed necessary and there exists no reasonable alternatives for security purposes. An exemption may be granted only for property located in a Light Manufacturing Zone (M-L) or Heavy Manufacturing Zone (M-H).