Mo. Rev. Stat. § 92.800
92.800 Equity rules of procedure required, exception.
92.800. Equity rules of procedure required, exception. — Except as herein provided, the rules of civil procedure in equity cases, in force at the time when any proceeding is had in the suit, shall be followed in all suits brought pursuant to the provisions of sections 92.700 to 92.920 .
(L. 1971 H.B. 472 § 18)