Iowa Code § 321.20B
97 Acts, ch 139, §2, 17, 18; 98 Acts, ch 1100, §41; 98 Acts, ch 1121, §1 -4, 8, 9; 99 Acts, ch 110, §1; 99 Acts, ch 114, §19; 2001 Acts, ch 32, §16; 2002 Acts, ch 1050, §32; 2003 Acts, ch 151, § 23 - 25; 2006 Acts, ch 1144, §1 - 3; 2007 Acts, ch 215, § 105; 2008 Acts, ch 1031, § 111; 2012 Acts, ch 1138, § 29; 2013 Acts, ch 103, § 5, 6
Referred to in §321.1, 321.54, 321.55, 321.89, 321.234A, 321.515, 321.516, 321A.34, 321K.1, 321N.4, 322.7B, 326.25, 331.557, 805.8A(14)(f)