|(a) Buildings should protect inmates from one another, protect custodial personnel from inmates, and deter or prevent escapes. Separate secure storage space shall be provided for disposition of weapons. (b) A minimum security facility need not be designed and maintained as a special security unit. It does not require a security perimeter. When built in conjunction with other jail or lockup functions, the integrity of the security perimeter of the higher security facility shall not be compromised. (c) A security perimeter to restrict the movement of inmates and unauthorized persons and to prevent the introduction of contraband into the facility shall be maintained in medium and maximum security facilities. Safety vestibules shall be provided for each inmate living area and day room used for confinement of three or more inmates within a medium or maximum security facility.