D.C. Mun. Regs. tit. 5-E, § 1111
1111.1 An individual serving in the Educational Service shall have served one (1) full year at the next lower grade in the normal line of progression for the position being filled before being eligible for permanent or temporary promotion, including a promotion accomplished by reinstatement, unless one of the following applies:
1111.2 The Division of Personnel shall specify the conditions for crediting prior service toward meeting time-in-grade requirements, as well as circumstances that may warrant an exception.
SOURCE: Final Rulemaking published at 27 DCR 4297, 4326 (October 3, 1980).