A person who holds a milk hauler permit or a milk grader permit pursuant to section 192.111 may mix a harmless coloring matter in unlawful milk as provided in section 194.9 to prevent the unlawful milk from being processed and used in any form for human consumption.
Iowa Code § 194.18
97 Acts, ch 94, §9; 2002 Acts, ch 1148, §7, 11