Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 94, § 13B

Any person selling milk graded as described in the rules and regulations adopted and approved under section twelve, or amended from time to time under authority thereof, in addition to such labelling as may be required, may state upon the package in which such milk is contained the state wherein such milk was produced; provided that all the milk contained in such package so labelled was produced exclusively in one state.