Mo. Rev. Stat. § 630.945
Beginning July 1, 2013, no state employee, regardless of job classification, who is working in a maximum or intermediate security mental health facility or any portion of a mental health facility which has maximum or intermediate security shall be mandated to work more than twelve hours in any twenty-four hour period unless the department of mental health declares an emergency workforce shortage.
(L. 2012 H.B. 1318)