Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 231, § 85M

In any action of contract or tort in which the defendant is the owner or operator of a privately or publicly owned or operated garage, lot, or other facility used for the parking or storage of motor vehicles for a fee, it shall not constitute a defense that said owner or operator, by means of language appearing on any sign, ticket, or receipt, sought to disclaim, limit or exclude his legal liability. Any such disclaimer, limitation or exclusion of liability shall be void as against public policy.