321.238  Use of electronic devices while driving — preemption of local legislation.
  The provisions of this chapter restricting the use of electronic communication devices and electronic entertainment devices by motor vehicle operators shall be implemented uniformly throughout the state. Such provisions shall preempt any county or municipal ordinance regarding the use of an electronic communication device or electronic entertainment device by a motor vehicle operator. In addition, a county or municipality shall not adopt or continue in effect an ordinance regarding the use of an electronic communication device or electronic entertainment device by a motor vehicle operator.
2010 Acts, ch 1105, §5