Iowa Code 123.47A Persons age eighteen, nineteen, and twenty---penalty.
1. A person shall not sell, give, or otherwise supply alcoholic liquor, wine, or beer to any person knowing or having reasonable cause to believe that the person is age eighteen, nineteen, or twenty. A person age eighteen, nineteen, or twenty shall not purchase or possess alcoholic liquor, wine, or beer. However, a person age eighteen, nineteen, or twenty may possess alcoholic liquor, wine, or beer given to the person within a private home with the knowledge, presence, and consent of the person's parent or guardian, or with the signed, written consent of the parent or guardian specifying the date and place for the consumption and displayed by the person upon demand, and a person age eighteen, nineteen, or twenty may handle alcoholic liquor, wine, and beer during the course of the person's employment by a liquor control licensee, or wine or beer permittee. A person, other than a licensee or permittee, who commits a first offense under this section commits a scheduled violation of section 805.8, subsection 10. A person, other than a licensee or permittee, who commits a second or subsequent violation of this section, commits a simple misdemeanor. A licensee or permittee who violates this section with respect to a person who is age nineteen or twenty is guilty of a simple misdemeanor punishable by a fine of not more than fifty dollars.
