Iowa Code § 123.53
85 Acts, ch 32, §45 - 47; 86 Acts, ch 1246, §603, 747; 88 Acts, ch 1151, §1; 88 Acts, ch 1250, §10; 92 Acts, ch 1242, §25; 93 Acts, ch 91, §19; 99 Acts, ch 199, §32; 2003 Acts, ch 145, §286; 2005 Acts, ch 179, §144, 146; 2006 Acts, ch 1010, §51; 2007 Acts, ch 126, §23; 2009 Acts, ch 41, §263; 2009 Acts, ch 173, §31, 32, 36; 2010 Acts, ch 1184, §92; 2011 Acts, ch 34, §35; 2012 Acts, ch 1021, §136