Mo. Rev. Stat. § 269.080
The state veterinarian is authorized to grant a permit or license permitting the bodies of dead animals to be transported over the highways of this state to a disposal plant located outside the boundaries of this state, with proper identification tags, to a resident truck owner upon the payment of a fee of twenty-five dollars per annum for the first such truck and a fee of ten dollars per annum for each such additional truck, permitting such truck owner to transport dead bodies outside the state, providing the truck owner and his truck meet the conditions and specifications of this chapter, together with such rules and regulations as the state veterinarian may prescribe, and further, that in any section or locality of this state which is now or which may hereafter be served in a sanitary manner by a dead animal disposal plant located outside the boundaries of this state, the state veterinarian is authorized to issue a permit or license, with proper identification tags, to such owner or operator operating any truck owned by or serving such nonresident disposal plant, upon proper application and payment of a fee of fifty dollars per annum for the first such truck owned or leased and operated in Missouri by or for said nonresident disposal plant and ten dollars per annum for each additional truck or vehicle owned or leased and operated in Missouri by or for said nonresident disposal plant and twenty dollars per annum for each substation operated by or for such nonresident dead animal disposal plant; such permit or license shall permit any such truck owner or operator to transport such bodies of dead animals to any disposal plant outside of this state providing the vehicle or vehicles used by such truck owner or operator meet the standards and specifications prescribed for such vehicles by this chapter, and such rules and regulations as prescribed by the state veterinarian under this chapter for the transportation of bodies of dead animals within this state. Application for such permit or license shall contain an agreement by the owner or operator of said vehicle that he shall fully comply with the provisions of section 269.150, and that the operator thereof shall, upon reentering this state after unloading at such disposal plant, be prepared to certify under oath that the acts required in section 269.150 have been fully performed. The state veterinarian may for cause issue an order revoking or suspending any such permit or license with the right of the licensee or permittee to appeal as is provided in this chapter for disposal plants located within this state.
§ 269.080, RSMo