Maryland Family Law Section 9-305

      (a)      If a child is under the age of 16 years, a relative who knows that another person is the lawful custodian of the child may not:

            (1)      abduct, take, or carry away the child from the lawful custodian to a place in another state;

            (2)      having acquired lawful possession of the child, detain the child in another state for more than 48 hours after the lawful custodian demands that the child be returned;

            (3)      harbor or hide the child in another state knowing that possession of the child was obtained by another relative in violation of this section; or

            (4)      act as an accessory to an act prohibited by this section.

      (b)      If a child is under the age of 16 years, a relative who knows that another person is the lawful custodian of the child may not:

            (1)      abduct, take, or carry away the child from the lawful custodian to a place that is outside of the United States or a territory of the United States or the District of Columbia or the Commonwealth of Puerto Rico;

            (2)      having acquired lawful possession of the child, detain the child in a place that is outside of the United States or a territory of the United States or the District of Columbia or the Commonwealth of Puerto Rico for more than 48 hours after the lawful custodian demands that the child be returned;

            (3)      harbor or hide the child in a place that is outside of the United States or a territory of the United States or the District of Columbia or the Commonwealth of Puerto Rico knowing that possession of the child was obtained by another relative in violation of this section; or

            (4)      act as an accessory to an act prohibited by this section.