Mass. Gen. Laws ch. 272 § 98A
Notwithstanding any other provision of law, any blind person, or deaf or hearing handicapped person, or other physically handicapped person accompanied by a dog guide, shall be entitled to any and all accommodations, advantages, facilities and privileges of all public conveyances, public amusements and places of public accommodation, within the commonwealth, to which persons not accompanied by dogs are entitled, subject only to the conditions and limitations applicable to all persons not accompanied by dogs, and no such blind person, or deaf or hearing handicapped, or other physically handicapped person shall be required to pay any charge or fare for or on account of the transportation on any public conveyance for himself and such dog so accompanying him in addition to the charge or fare lawfully chargeable for his own transportation. Whoever deprives any blind person, or deaf or hearing handicapped person, or other physically handicapped person of any right conferred by this section shall be punished by a fine of not more than three hundred dollars and shall be liable to any person aggrieved thereby for such damages as are set forth in section five of chapter one hundred and fifty-one B; provided, however, that such civic forfeiture shall be of an amount not less than one hundred dollars.
Mass. Gen. Laws ch. 272, § 98A