Maryland Transportation Section 16-809
§ 16-809.
  A person may drive a commercial motor vehicle if:
    (1)   The person holds a valid commercial driver's license issued by any:
      (i)   State in accordance with the minimum federal standards for the issuance of a commercial driver's license; or
      (ii)   Foreign jurisdiction that the United States Department of Transportation has determined issues commercial drivers' licenses in accordance with the minimum federal standards;
    (2)   The person's driver's license is not refused, suspended, revoked, or canceled;
    (3)   The person is not disqualified from driving a commercial motor vehicle in any state;
    (4)   The person is not disqualified from driving a commercial vehicle by the United States Department of Transportation;
    (5)   The person is not subject to an out-of-service order as defined in § 16-812(i)(1)(ii) of this subtitle;
    (6)   The person has the commercial driver's license in the person's possession; and
    (7)   The person's commercial driver's license is valid for the type of vehicle being driven, as determined by regulation established by the United States Department of Transportation.