Massachusetts General Laws Part II. Real and Personal Property and Domestic Relations (Ch. 183-210) Ch. 183, § 41

The proof of a deed or other instrument, if made without the commonwealth in some state, territory, district or dependency of the United States, may be made before any of the persons enumerated in clause (b) of section thirty; provided, however, that a certificate of authority as provided in section thirty-three shall be attached thereto; if without the United States or any dependency thereof, such proof may be made before any of the persons enumerated in clause (c) of said section thirty.