Maryland Constitution of 1867 Art. 4, § 15

Any justice of the Supreme Court of Maryland or of an intermediate court of appeal who heard the cause below either as a trial judge or as a judge of any intermediate court of appeal as the case may be shall not participate in the decision. In every case an opinion, in writing, shall be filed within three months after the argument, or submission of the cause; and the judgment of the Supreme Court of Maryland shall be final and conclusive.