Maryland Health - General Section 20-110

      (a)      Except as provided in subsection (b) of this section, the following are not civilly liable for taking a blood sample from an individual without consent of the individual or for testing the blood sample, if the blood is taken at the request of a police officer or a sheriff or officer in a sheriff's office for a criminal investigation:

            (1)      A licensed hospital.

            (2)      A physician.

            (3)      Any of the following who take the blood in the course of duties at a licensed hospital:

                  (i)      A resident.

                  (ii)      An intern.

                  (iii)      A registered nurse.

                  (iv)      A health career technician.

      (b)      A person who negligently takes blood samples in a manner otherwise than according to accepted medical practices or who negligently performs tests is subject to civil liability for injury resulting from the person's negligence.