Mass. Gen. Laws ch. 90, § 9A: Safety glass; windshields, windows

Section 9A. No person shall operate any motor vehicle, and the owner or custodian of a motor vehicle shall not permit the same to be operated with partitions, doors, windows or windshields of glass unless such glass is of a type known as safety glass. The term ''safety glass'', as used herein, shall include any glass designed to minimize the likelihood of personal injury from its breaking or scattering when broken. This section shall not apply to motor vehicles manufactured prior to January first, nineteen hundred and thirty-six.