Iowa Code § 16.92
99 Acts, ch 54, §1; 2000 Acts, ch 1166, §2-5; 2001 Acts, ch 24, §15; 2005 Acts, ch 26, §1, 2; 2007 Acts, ch 52, §1 - 4; 2008 Acts, ch 1191, §32; 2013 Acts, ch 85, § 1, 2; 2014 Acts, ch 1012, § 6; 2014 Acts, ch 1080, § 67, 78; 2015 Acts, ch 30, § 26; 2016 Acts, ch 1011, § 3