724.28  Prohibition of regulation by political subdivisions — exception.
  1.  As used in this section, “political subdivision of the state” means a city, county, or township.
  2.  A political subdivision of the state shall not enact an ordinance, motion, resolution, policy, or amendment regulating the ownership, possession, carrying, legal transfer, lawful transportation, modification, registration, or licensing of firearms, firearms attachments, or other weapons when the ownership, possession, carrying, transfer, transportation, or modification is otherwise lawful under the laws of this state. An ordinance regulating firearms, firearms attachments, or other weapons in violation of this section existing on or after April 5, 1990, is void.
  3.  If a political subdivision of the state, prior to, on, or after July 1, 2020, adopts, makes, enacts, or amends any ordinance, measure, enactment, rule, resolution, motion, or policy regulating the ownership, possession, carrying, legal transfer, lawful transportation, modification, registration, or licensing of firearms, firearms attachments, or other weapons when the ownership, possession, carrying, transfer, transportation, modification, registration, or licensing of firearms, firearms attachments, or other weapons is otherwise lawful under the laws of this state, a person adversely affected by the ordinance, measure, enactment, rule, resolution, motion, or policy may file suit in the appropriate court for declaratory and injunctive relief and all damages attributable to the violation. A court shall also award the prevailing party in any such lawsuit reasonable attorney fees and court costs.
  4.  A political subdivision of the state may restrict the carrying, possession, or transportation of firearms or other dangerous weapons in the buildings or physical structures located on property under the political subdivision’s control if adequate arrangements are made by the political subdivision to screen persons for firearms or other dangerous weapons and the political subdivision provides armed security personnel inside the building or physical structure where the restriction is to be in effect.
  5.  A political subdivision of the state shall not enact an ordinance, motion, resolution, policy, or amendment regulating the storage of weapons or ammunition. An ordinance, motion, resolution, policy, or amendment regulating the storage of weapons or ammunition existing on or after July 1, 2020, is void. This subsection shall not be construed to preclude a political subdivision from regulating the storage of explosive materials consistent with chapter 101A.
90 Acts, ch 1147, §9; 2017 Acts, ch 69, §32; 2020 Acts, ch 1099, §3, 4; 2021 Acts, ch 35, §21