(a)      Except as provided in subsection (b) of this section, a judge of the court may not act as an attorney at law in a civil or criminal matter during a term of office.

      (b)      This section does not apply:

            (1)      In Harford County;

            (2)      In Montgomery County;

            (3)      In Baltimore City, to a judge of the Court while practicing law before any court of the State except an orphans' court; or

            (4)      In Prince George's County, Baltimore County, Calvert County, and Howard County, to a judge of the Court while practicing law in connection with a case that is:

                  (i)      Outside the jurisdiction of orphans' court; and

                  (ii)      Unrelated to the administration of an estate or guardianship.