Mass. Gen. Laws ch. 90 § 8N
The registry of motor vehicles shall permit a person submitting an application under sections 8, 8B or 8E of this chapter or section 34B of chapter 138 to designate "X", "M" or "F" for gender on an application for a driver's license, learner's permit, identification card or liquor purchase identification card. No documentation shall be required for such a designation.
The registrar of motor vehicles shall report annually to the chairs of the joint committee on transportation on the number of people, indicated by race and ethnicity, who choose an "X" designation on their driver's license, learner's permit, identification card or liquor purchase identification card; provided, however, that data included in the report shall be de-identified so that the identification of an individual person cannot be ascertained.
The registrar of motor vehicles may promulgate regulations to implement this section.
Mass. Gen. Laws ch. 90, § 90:8N