Mo. Rev. Stat. § 50.150
County warrants issued under the authority of sections 50.160 to 50.320, issued to pay any legal indebtedness of a county may be pooled by the holders thereof and assigned to such county and be pledged by the county commission to any corporation, commission or agency created or authorized by congress or the state of Missouri to accept a pledge of such warrants, and the county commission is authorized to pledge the warrants of any county issued under sections 50.160 to 50.320 in a manner to conform to the requirements, rules and/or regulations of any such corporation, commission or agency. Upon a pledge of any such warrants, as by this section authorized, funds available or to be available shall be segregated and set apart for the redemption of such warrants and interest thereon from the terms of such pledge in the same manner as if said warrants had been sold, and the lien of such pledged warrants and interest thereon shall be enforced in the same manner as provided in sections 50.160 to 50.320 for warrants sold. Funds derived from a pledge of any such warrants shall be deposited, accounted for and paid to parties so pooling them in the same manner as if such warrants had been sold or as may be provided by the requirements, rules and/or regulations of the corporation, commission or agency accepting a pledge of such warrants and advancing funds thereon.
§ 50.150, RSMo