Maryland Code, Criminal Procedure § 2-306

(a) If an officer of another state makes an arrest in this State in accordance with § 2-305(a) of this subtitle, the officer shall, without unnecessary delay, take the person arrested before a judge of the circuit court of the county in which the arrest was made for a hearing to determine the lawfulness of the arrest.

(b) If the judge determines that the arrest was unlawful, the judge shall discharge the arrested person.