Texas Civil Practice and Remedies Code - CIV PRAC & REM § 121.013. Subpoena of Witness; Attachment

(a) On the sworn application of a person interested in the proof of an instrument required or permitted by law to be recorded, stating that a witness to the instrument refuses to appear and testify regarding the execution of the instrument and that the instrument cannot be proven without the evidence of the witness, an officer authorized to take proofs of instruments shall issue a subpoena requiring the witness to appear before the officer and testify about the execution of the instrument.

(b) If the witness fails to obey the subpoena, the officer has the same powers to enforce the attendance and compel the answers of the witness as does a district judge. Attachment may not be issued, however, unless the witness receives or is tendered the same compensation that is made to witnesses in other cases. An officer may not require the witness to leave his county of residence, but if the witness is temporarily present in the county where the execution of the instrument is sought to be proven for registration, he may be required to appear.