Mass. Gen. Laws ch. 222, § 6: Powers and duties

Section 6. A commissioner may, in his state, territory, district, dependency or country, administer oaths and take depositions, affidavits and acknowledgments of deeds and other instruments, to be used or recorded in this commonwealth, and the proof of such deeds, if the grantor refuses to acknowledge the same, all of which shall be certified by him under his official seal.