Mo. Rev. Stat. § 50.1010
There is hereby authorized a "County Employees' Retirement Fund" which shall be under the management of a board of directors described in section 50.1030. The board of directors shall be responsible for the administration and the investment of the funds of such county employees' retirement fund. If insufficient funds are generated to provide the benefits payable pursuant to the provisions of sections 50.1000 to 50.1200, the board shall apportion the benefits according to the funds available. Notwithstanding any provision of sections 50.1000 to 50.1200 to the contrary, an individual who is in a job classification that the retirement system finds not eligible for coverage under the retirement system as of September 1, 2001, shall not be considered an employee for purposes of coverage in the retirement system, unless adequate additional funds are provided for the costs associated with such coverage.
§ 50.1010, RSMo