Mo. Rev. Stat. § 478.020: Expenses of judge when serving outside regular circuit.

Each circuit and associate circuit judge when temporarily serving, transferred or assigned as a judge of a court sitting outside of such judge's own circuit, in addition to the salary and expense money herein provided, shall be reimbursed from the state treasury for all reasonable and necessary travel and subsistence expenses incurred in connection with his service, assignment or transfer to the other court.