No member of the Police Department shall discharge firearms on or off duty, except in the following cases: In self-defense or in the defense of another when no apparent alternative exists for protection from what appears to be a significant and immediate threat of death or serious physical injury. To apprehend a fleeing person when no reasonable alternative for apprehension exists and the officer has probable cause to believe that the person has committed a crime involving the infliction or threatened infliction of serious physical injury and poses an immediate and significant threat of serious physical injury to the officer or to others. To kill a dangerous animal or to kill an animal so badly injured that humanity requires its relief from further suffering. When used in practice on the range. Lawful game hunting. Firearms shall be kept out of reach of the public and shall be secured in appropriate locked containers when not in the immediate possession or control of the sworn police officer. Riot equipment shall be kept under lock and key, in an inconspicuous place, and shall not be displayed to the general public.