Maryland Code, Courts and Judicial Proceedings § 6-409

(1) The entry of appearance is made in good faith and not for purposes of delay;

(2) The case has not been continued previously an unreasonable number of times;  and

(3) At the time his appearance is entered he is the attorney of record in another court proceeding which previously had been scheduled for a time which will cause a conflict with the case in which the appearance is being entered.