Mo. Rev. Stat. § 340.326

Any person registered as a veterinary technician and while practicing as a veterinary technician in this state must at all times be under the supervision of a licensed veterinarian or a veterinarian exempt from licensing under sections 340.200 to 340.330. The level of supervision shall be consistent with the delegated animal health care task. The board shall by rule establish, in general or specific terms as it deems necessary, the animal health care tasks that veterinary technicians may provide and the level of supervision that is required by the licensed veterinarian for any delegated health care task.