Maryland Statutes
Subtitle 3 - Removal of Child From State; Child Abduction
Section 9-303 - Conflict as to Lawful Custodian

(a)    This section applies if there is a conflict between a custody order of a court of this State and a custody order of a court of another state.
    (b)    Except as provided in subsection (c) of this section, a custody order of a court of this State prevails over a custody order of a court of another state.
    (c)    A custody order of a court of another state prevails over a custody order of a court of this State if the court in the other state passed its custody order:
        (1)    after the custody order was passed by a court of this State; and
        (2)    in proceedings in which the lawful custodian under the custody order of a court of this State:
            (i)    consented to the custody order passed by the court of the other state; or
            (ii)    participated personally as a party.