Missouri Revised Statutes Title XXIX. Ownership and Conveyance of Property § 442.330. Subscribing witnesses, when and how summoned to prove execution of instrument

Upon the application of any grantee in any instrument in writing required to be recorded or of any person claiming under such grantee, verified by the oath of the applicant, that any witness to such instrument residing in the county where such application is made refuses to appear and testify touching the execution thereof, and that such instrument cannot be proved without his evidence, any court or officer authorized to take the acknowledgment or proof of such instrument may issue a subpoena requiring such witness to appear before such court or officer and testify touching the execution thereof.