Mo. Rev. Stat. § 525.190: Denial of garnishee to answer, how — replication — issues tried, how.

The plaintiff may deny the answer of the garnishee, in whole or in part, without oath. In all cases where the answer of the garnishee is denied, the denial shall contain, specially, the grounds upon which a recovery is sought against the garnishee; and the garnishee shall be entitled to a reply, and the issue or issues made up on the denial and reply shall be the sole issue or issues tried, and the issue or issues shall be tried as ordinary issues between plaintiff and defendant.