Md. Code, Courts and Judicial Proceedings § 5–526

(a) A member of a state legislature, including a member of the General Assembly of Maryland, who makes a communication on behalf of a constituent is not civilly liable for defamation unless the communication is false and made with knowledge of or in reckless disregard of its falsity.

(b) This section does not supersede or constitute a waiver of a member’s constitutional, statutory, or common law privileges or immunities.