Mass. Gen. Laws ch. 266 § 92A
Whoever sells a motor vehicle knowing that its engine or electrical parts have been submerged in water, or knowing that it has been used as a police car, a taxicab, a rental vehicle by a motor vehicle rental agency, or a leased vehicle which has been leased to any corporation, individual or entity, other than a motor vehicle rental company, without indicating such fact in writing on the bill of sale, and whoever, other than the commonwealth or any political subdivision thereof, sells any such police car to an ultimate user for other than police purposes without first having obliterated all evidence of distinctive police insignias or markings thereon, and painting the exterior of every marked state police vehicle thereof one solid color, shall be punished by a fine of not less than ten nor more than five hundred dollars.
Mass. Gen. Laws ch. 266, § 92A