Maryland Code, Courts and Judicial Proceedings § 5-1005

(c)(1) A prisoner who has filed three or more civil actions that have been declared to be frivolous by a court of this State or a federal court for a case originating in this State may not file any further civil actions without leave of court.

(2) If a prisoner has filed three or more civil actions that have been declared to be frivolous by a court of this State or a federal court for a case originating in this State, a court may place the prisoner's remaining and future civil actions on an inactive case list and permit the prisoner to pursue only one civil action at a time, regardless of jurisdiction.