Iowa Code § 710A.3

It shall be an affirmative defense, in addition to any other affirmative defenses for which a defendant may be eligible, to a prosecution for a criminal violation of section 152C.5B, 152C.5C, 157.4A, 157.4B, 710A.2, 710A.2A, or 710A.2B, that the violation directly resulted from the defendant’s status as a victim of any human trafficking crime under chapter 710A.