Mo. Rev. Stat. § 441.760: Immediate removal of parties other than tenant, when — immediate removal of tenant or lessee, when.

1. If the plaintiff has met its burden of proof for a complete eviction but the tenant successfully pleads an affirmative defense to the eviction pursuant to section 441.750, then the court shall not terminate the tenancy but shall order the immediate removal of any person who the court finds conducted the drug-related activity which was the subject of the eviction proceeding.

2. If the plaintiff presents evidence that a person is not lawfully occupying a dwelling unit as either a tenant or a lessee, the court shall order the immediate removal of such person unlawfully occupying the dwelling unit.