(a) Storerooms shall be constructed and secured to prevent unauthorized access and the entrance doors shall be equipped for locking.

(b) Each stationary tank used for the storage of specially denatured spirits shall be equipped for locking to control access to the denatured spirits. An accurate means of measuring its contents shall be provided for each tank.

(c) Storerooms and storage tanks shall be kept locked when unattended. A storage cabinet or locker kept inside a room which is locked when unattended is considered to be adequately secured.