Mo. Rev. Stat. § 273.335
When, in the judgment of the state veterinarian or an animal welfare official, any person has been in violation of sections 273.325 to 273.357 so as to pose a substantial ongoing risk to the health and welfare of animals in his custody or so as to pose a substantial ongoing risk that consumers will purchase diseased animals from such person, the director may apply to the circuit court of the county in which such person resides, and such court may grant an order enjoining temporarily or permanently that person from engaging in activities described in section 273.327. If the animals being held in any of the facilities licensed under sections 273.325 to 273.357 are found to be suffering unrelieved pain or distress or disease, the animals may be taken into custody for humane euthanasia at the expense of the licensee. Reasonable effort shall be made to notify the facility operator of such intent and only upon his refusal or inability to immediately correct the causative violation and provide adequate veterinary care shall such action be taken. Nothing in sections 273.325 to 273.357 shall be construed to interfere with scientific research as enunciated in subsection 2 of section 273.354.
§ 273.335, RSMo