Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 233, § 73

All oaths and affidavits administered or taken by a notary public, duly commissioned and qualified by authority of any other state or government, within the jurisdiction for which he is commissioned, and certified under his official seal, shall be as effectual in this commonwealth as if administered or taken and certified by a justice of the peace therein.