Mo. Rev. Stat. § 545.740: Witnesses to enter into recognizance, when.

Whenever a criminal case shall be continued, all the witnesses in attendance shall be called by the court, and as many of them as the parties may desire shall be required to enter into recognizance for their appearance on the day of the next term on which such case shall be set for trial, which day shall be fixed and designated by the court at the time the continuance is granted; and if any such witness shall fail to appear in said court when so called, for the purpose of being recognized, such witness shall forfeit all his fees as witness in such cause, and may be compelled to appear by attachment.