Mo. Rev. Stat. § 524.080
Current with changes from the 2023 Legislative Session
To entitle the plaintiff to recover, it shall be sufficient for him to show that, at the time of the commencement of the action, the defendant was in possession of the premises claimed, and that the plaintiff had such right to the possession thereof as is declared by this chapter to be sufficient to maintain the action.
§ 524.080, RSMo
RSMo 1939 § 1536