Mass. Gen. Laws ch. 94, § 48D

No person shall blend milk and cream for sale, nor have any such blend in his custody or possession with intent to sell the same, unless the blending has been done in a pasteurization plant licensed under the provisions of section sixteen K or section forty-eight A. Whoever violates any provision of this section shall be punished by a fine of not less than twenty-five nor more than one hundred dollars for each offense.