Mo. Rev. Stat. § 491.190
Current with changes from the 2023 Legislative Session
The court shall have power to impose a fine, not exceeding fifty dollars, on every person duly summoned as a witness, who shall not appear and testify; which fine may be remitted, for good cause shown, at the term to which he is summoned, or the next term thereafter.
§ 491.190, RSMo
RSMo 1939 § 1903