Md. Code, State Personnel and Pensions § 27–201

(a) The following individuals are members of the Judges’ Retirement System:

(1) a judge of the Supreme Court of Maryland, Appellate Court of Maryland, circuit court of a county, or District Court of Maryland;

(2) a member of the State Workers’ Compensation Commission; and

(3) a magistrate in chancery or magistrate in juvenile causes who:

(i) was appointed by the circuit court of a county on or before June 30, 1989; and

(ii) serves full time as a magistrate.

(b) A former judge who is temporarily assigned to sit in a court of the State under the authority of Article IV, § 3A of the Maryland Constitution is not a member.