The Police Commissioner may establish, alter, recertify, or terminate the certification of drug-free zones from time to time. But any such certification will expire 3 months from the date of its certification unless recertified for an additional 3 months prior to expiring. City Code, 1976/83, art. 19, §58C(e)(1)(2nd sen.) Ord. 89-375 Ord. 90-561A Ord. 22-124