Mass. Gen. Laws ch. 147, § 10F

Any board or officer authorized to appoint police officers in any city or town which accepts this section, and any college, university or other educational institution empowered by law to make or establish rules or regulations regulating the parking of motor vehicles, may appoint parking control officers who shall have only those powers and duties conferred or imposed on police officers by section twenty A or twenty A1/2 of chapter ninety.