Maryland Statutes
Subtitle 4 - Judicial Probate
Section 5-402 - When Mandatory

A proceeding for judicial probate shall be instituted at any time before administrative probate or within the period after administrative probate provided by § 5–304 of this title:
        (1)    At the request of an interested person;
        (2)    By a creditor in the event that there has been no administrative probate;
        (3)    If it appears to the court or the register that the petition for administrative probate is materially incomplete or incorrect in any respect;
        (4)    If the will has been torn, mutilated, burned in part, or marked in a way as to make a significant change in the meaning of the will; or
        (5)    If it is alleged that a will is lost or destroyed.