Iowa Code § 453B.18
Notwithstanding any provision of this chapter to the contrary, a person shall not be guilty of an offense under this chapter for producing or possessing the plant cannabis, to the extent that the person is a USDA licensee acting in accordance with the federal hemp law, as those terms are defined in chapter 204A.
2019 Acts, ch 130, §32, 33; 2024 Acts, ch 1177, §53, 55