812.1725  Preemption.--A political subdivision of this state may not adopt, for convenience businesses, security standards which differ from those contained in ss. 812.173 and 812.174, and all such differing standards, whether existing or proposed, are hereby preempted and superseded by general law, except any local ordinance in effect prior to September 1988 and determined by the Department of Legal Affairs to provide more stringent security standards than those contained in ss. 812.173 and 812.174 shall not be preempted and superseded by general law for a period of 2 years from December 31, 1992.