Massachusetts General Laws Part IV. Crimes, Punishments and Proceedings in Criminal Cases (Ch. 263-280) Ch. 271, § 22B

Nothing in this chapter shall authorize the prosecution, arrest or conviction of any person for promoting or playing, or for allowing to be conducted, promoted or played, the game commonly called beano, or substantially the same game under another name in connection with which prizes are offered to be won by chance or for selling lottery tickets or shares; provided, said game or sales are conducted under a license issued by the director of the state lottery, under the provisions of sections thirty-seven or thirty-eight of chapter ten.