Section 124B.3 - Identification required1. 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.