Mo. Rev. Stat. § 492.100: Commissioners of foreign courts may compel attendance of witnesses.

Commissioners appointed by any other state, or any of the territories of the United States, or the District of Columbia, for the purpose of taking depositions and affidavits, and the acknowledgments of deeds, powers of attorney and other instruments of writing, and residing in this state, shall have the same power to compel the attendance of witnesses in the taking of depositions and the proof of deeds, and in all other cases where it may be necessary in the discharge of the duties of their office, as is now given by law to any court of record in this state, in compelling the attendance of witnesses before such court.