Mass. Gen. Laws ch. 231, § 85AA

No person duly registered by the department of state police as a search and rescue volunteer who renders assistance in a search and rescue operation under the direct control and instruction of the department and no other person who volunteers in a search and rescue operation and renders assistance, supervised by and under the direct control and instruction of the department shall be liable in any suit for damages as a result of any acts or omissions committed by such person in the course of a search for a missing person, if such person acts in compliance with the Massachusetts state police search and rescue plan, unless such acts or omissions constitute willful, wanton or reckless conduct.