A “certified drug-free zone” is a geographical area of Baltimore City certified as such by the Police Commissioner, including but not limited to identifiable segments of streets, alleys, walkways, parks, recreation centers, schools, bus stations, train depots, taxi stands, commercial parking lots, places of public accommodation and convenience, public housing complexes, and public access areas in residential apartment structures. City Code, 1976/83, art. 19, §58C(e)(1)(1st sen.) Ord. 89-375 Ord. 90-561A