CODE OF VIRGINIA SCHOOL BUS EMERGENCY DRILLS (§ 22.1-184) At every public school having public school buses there shall be held, at least once during the first ninety calendar days of each school session and oftener if necessary, a drill in leaving school buses under emergency circumstances. HISTORY: Code 1950, § 22-280.2; 1964, c. 174; 1980, c. 559.