Maryland Financial Institutions Section 12-602
§ 12-602.
  (a)   In this section, "fiduciary" includes the fiduciary's successor.
  (b)   Except as provided in subsection (c) of this section, if a safe-deposit company rents a safe-deposit box to a fiduciary, the safe-deposit company may not permit access to the safe-deposit box:
    (1)   By any person other than the fiduciary; and
    (2)   If the safe-deposit box is rented to two or more fiduciaries, by less than all of the fiduciaries in person.
  (c)   The safe-deposit company may permit access to the safe-deposit box by:
    (1)   Any individual authorized by all of the fiduciaries, in accordance with a rental agreement, written power of attorney, or other written authority signed by each fiduciary and filed with the safe-deposit company; and
    (2)   Less than all of the fiduciaries, in accordance with a rental agreement, written power of attorney, or other written authority signed by the remaining fiduciaries and filed with the safe-deposit company.