No member of the fire department shall be under the influence of intoxicating liquors, beverages, drugs or compounds while on duty. It shall further be a violation of this chapter to keep or maintain any such substances at the fire station or on the fire apparatus. (Ord. 97-03 (part), 1997; Ord. 88-20 § 12 (part), 1988; Ord. 68B § 18 (part))