Notwithstanding the provisions of section 211.331 or any other provision of law in conflict with the provisions of this section, no county which becomes a county of the second class after September 28, 1987, shall be required to provide a place of detention for children. The governing body of any such county may provide such a facility, and if it does so, then all provisions of law relating to the operation and support of such a facility by a county of second class shall be applicable.