S.C. Code Ann. § 44-80-60: Immunity from civil and criminal liability.

(A) Any individual acting in good faith as a legal representative who executes a POST form on behalf of an incapacitated patient in accordance with this chapter, the Adult Health Care Consent Act, and regulations promulgated pursuant to those statutes is not subject to criminal prosecution or civil liability for executing the POST form.

(B) A health care provider, health care facility, or other person who has not received actual notice of the revocation of a POST form and complies with the wishes stated in the POST form is not subject to civil or criminal liability or professional disciplinary action for actions taken pursuant to this chapter which are in accordance with reasonable medical standards. This subsection provides an affirmative defense to any civil, criminal, or professional disciplinary action filed or instituted against a health care provider, health care facility, or other person for conduct authorized by this chapter.