Mo. Rev. Stat. § 491.370
Current with changes from the 2023 Legislative Session
If either party subpoena more than three witnesses to prove any one fact, or shall subpoena any person or persons and not examine them as witnesses on the trial, he shall pay the costs occasioned by such surplus or unnecessary witness or witnesses, unless the testimony of such unexamined witnesses shall be rendered unnecessary by admissions of the opposite party on the trial.
§ 491.370, RSMo
RSMo 1939 § 2657, A.L. 1945 p. 765 § 93