Md. Code, Land Use § 16–108

(a) If the board determines that the testimony of a witness is appropriate for the proper consideration of a case before the board, the board may issue a subpoena to the witness to appear at a proceeding the board conducts in accordance with this subtitle.

(b) If a person fails to comply with a subpoena issued under this section, the board may petition a court of competent jurisdiction to compel compliance with the subpoena.