This subtitle does not apply to any horse that is: in the custody of a zoological park or its agents or contractors, if the zoological park is licensed under this title and regulated by a Maryland or federal agency; in a laboratory where scientific research is carried out under regulation of a Maryland or federal agency; or regulated by the Maryland Racing Commission. City Code, 1976/83, art. 19, §32(a)(7)(parts) Ord. 99-548 Ord. 11-573