Whenever a witness in a criminal proceeding has been once subpoenaed or required to give bail to appear before any court, he shall attend from time to time, until the case is disposed of or he is finally discharged by the court. The witness shall be liable to attachment and bail may be forfeited for failure to appear if the witness has received notice of the time and place to appear.
Mo. R. Crim. P. 26.03
Committee Note-1979
The sources of the first sentence are prior Rule 25.17 and prior Rule 25.18.
The second sentence is new.