321I.9  Exempt vehicles.
  Registration shall not be required for the following described all-terrain vehicles:
  1.  All-terrain vehicles owned and used by the United States, another state, or a political subdivision of another state.
  2.  All-terrain vehicles used in accordance with section 321.234A, subsection 1, paragraph “a”.
  3.  All-terrain vehicles used exclusively as farm implements.
2004 Acts, ch 1132, §52; 2007 Acts, ch 141, §34