Any officer qualified to serve criminal process may, within his jurisdiction, arrest without a warrant any person found in the act of committing a misdemeanor in or upon any of the rivers, harbors, bays or sounds within the commonwealth.
Mass. Gen. Laws ch. 91, § 58
Arrest without warrant
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.