Maryland Code, Estates and Trusts § 18-109

(1) If the third party acted in good faith reliance on a decision made by an adult utilizing a supported decision-making agreement, complying with an adult's decision in accordance with a supported decision-making agreement or otherwise complying with a supported decision-making agreement based on a good faith assumption that the supported decision-making agreement was valid when made and not revoked or abrogated; or

(2) Declining to honor a decision made by an adult utilizing a supported decision-making agreement or failing to comply with a supported decision-making agreement based on a reasonable good faith belief that:

(1) Caused personal injury as a result of a negligent, reckless, or intentional act;

(2) Failed to give effect to an adult's decision made in accordance with a valid decision-making agreement;

(3) Failed to provide information either to the adult or a supporter of the adult that would be necessary for informed consent; or

(4) Otherwise acted inconsistently with applicable law.