Iowa Code
Chapter 453B - EXCISE TAX ON UNLAWFUL DEALING IN CERTAIN SUBSTANCES
Section 453B.6 - Chapter not applicable to lawful possession.

453B.6 Chapter not applicable to lawful possession.
This chapter does not require persons lawfully in possession of a taxable substance to pay the tax required under this chapter or to purchase, acquire, or affix the stamps, labels, or other official indicia otherwise required by this chapter.
90 Acts, ch 1251, §42
C91, §421A.6
C93, §453B.6