Maryland Code, Courts and Judicial Proceedings § 5-618

(a) Any person who files a petition, participates in the making of a good faith report, or participates in an investigation or in a judicial proceeding resulting from the filing of a petition or the making of a good faith report, under § 13-705 or § 13-709 of the Estates and Trusts Article or Title 14, Subtitle 3 of the Family Law Article, shall in so doing be immune from any civil liability or criminal penalty that might otherwise be incurred or imposed as a result thereof.

(b) A law enforcement officer is not civilly or criminally liable for transporting an adult to an appropriate medical facility under § 13-709 of the Estates and Trusts Article if the officer acts: