Miss. Code § 63-11-7
If any person be unconscious or dead as a result of an accident, or unconscious at the time of arrest or apprehension or when the test is to be administered, or is otherwise in a condition rendering him incapable of refusal, such person shall be subjected to a blood test for the purpose of determining the alcoholic content of his blood as provided in this chapter, if the arresting officer has reasonable grounds to believe the person to have been driving a motor vehicle upon the public highways, public roads and streets of this state while under the influence of intoxicating liquor. The results of such test or tests, however, shall not be used in evidence against such person in any court or before any regulatory body without the consent of the person so tested, or, if deceased, such person's legal representative. However, refusal of release of evidence so obtained by such officer or agency will in criminal actions against such person result in the suspension of his or her driver's license for a period of ninety days as provided in this chapter for conscious and capable persons who have refused to submit to such test. Blood may only be withdrawn under the provisions of Section 63-11-9. It is the intent of this chapter that blood samples taken under this section shall be used exclusively for statistical evaluation of accident causes with safeguards established to protect the identity of such victims and to extend the rights of privileged communications to those engaged in taking, handling and evaluating such statistical evidence.
Miss. Code § 63-11-7