Mo. Rev. Stat. § 191.170

Every person who shall willfully beat, strike, wound or injure any inmate of any institution under the control of the department of social services, or who shall in any other manner whatsoever mistreat or maltreat, handle or treat any such inmate in a brutal or inhuman manner, or who, in the handling of any such inmate, shall use any more force than is reasonably or apparently necessary for the proper control, treatment or management of such inmate, shall, upon conviction, be punished by a fine of not less than five dollars nor more than one hundred dollars, or by imprisonment in the county or city jail for not less than ten days nor more than six months, or by both such fine and imprisonment.