In counting votes when the ballots are removed from the ballot box, they shall first be sorted into piles, one for each party, and each pile shall be counted and sealed separately. Votes shall be counted only for nominations of the party on whose ballot they appear.
Mass. Gen. Laws ch. 53, § 39
Counting votes
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.