Maryland Code, Courts and Judicial Proceedings § 10-410

(a) Any person whose wire, oral, or electronic communication is intercepted, disclosed, or used in violation of this subtitle shall have a civil cause of action against any person who intercepts, discloses, or uses, or procures any other person to intercept, disclose, or use the communications, and be entitled to recover from any person:

(b) A good faith reliance on a court order or legislative authorization shall constitute a complete defense to any civil or criminal action brought under this subtitle or under any other law.