Iowa Code § 124B.3: Identification required.

1. Before selling, transferring, or otherwise furnishing any substance specified in section 124B.2 to a person in this state, a vendor shall require proper identification from the purchaser.

2. For the purposes of this section, in the case of a face-to-face purchase, “proper identification” means all of the following:

a. A driver’s license containing the purchaser’s photograph and residential or mailing address, other than a post office box number, or any other official state-issued identification containing this information.

b. The motor vehicle license number of the vehicle owned or operated by the purchaser.

c. A letter of authorization from the person who is making the purchase. The letter shall include the person’s business license number and business address, a description as to how the substance will be used, and the purchaser’s signature. The vendor shall affix the vendor’s signature as a witness to the signature and identification of the purchaser.

3. The board shall provide by rule for the form of proper identification required for purchases which are not face to face.

4. A person who violates this section or rules adopted pursuant to this section commits a simple misdemeanor.