Mo. Rev. Stat. § 411.028

Agricultural commodities delivered to a warehouse or seed processor for the express purpose of processing or cleaning and holding such commodity and returning the cleaned or processed commodity to the original owner thereof or the owner's designee to be used as seed shall not be deemed to be grain for the purposes of this chapter. Commodities deemed not to be grain pursuant to this section shall be maintained on an identity-preserved basis at all times when in the possession of or under the control of the warehouseman or seed processor.