Maryland Courts and Judicial Proceedings Section 10-303
§ 10-303.
  (a)   (1)   A specimen of breath or 1 specimen of blood may be taken for the purpose of a test for determining alcohol concentration.
    (2)   For the purpose of a test for determining alcohol concentration, the specimen of breath or blood shall be taken within 2 hours after the person accused is apprehended.
  (b)   (1)   Only 1 specimen of blood may be taken for the purpose of a test or tests for determining the drug or controlled dangerous substance content of the person's blood.
    (2)   For the purpose of a test or tests for determining drug or controlled dangerous substance content of the person's blood, the specimen of blood shall be taken within 4 hours after the person accused is apprehended.