Missouri Revised Statutes Title XVII. Agriculture and Animals § 281.080. Exemptions

(1) Veterinarians using pesticides on animals during the normal course of veterinary practice, as long as he is not regularly engaged in the business of using pesticides for hire amounting to a principal or regular occupation or does not publicly hold himself out as a pesticide applicator;

(2) Doctors of medicine or doctors of osteopathy using or prescribing pesticides in the practice of medicine;

(3) Government and private research personnel using pesticides under laboratory type conditions.