1. It is unlawful for the holder of a license or permit issued pursuant to the Iowa Alcoholic Beverage Control Act for premises where more than 50 percent of the business conducted is the sale or dispensing of alcoholic beverages and for every person employed with respect to such premises to knowingly permit or fail to take reasonable measures to prevent the entry onto such premises of any and all persons who have not yet attained the age for lawful purchase and possession of alcoholic beverages (who shall be referred to as underage persons for purposes of this section). This section shall only apply to premises where alcoholic beverages are sold and consumed. Any holder of a license or permit issued pursuant to the Iowa Alcoholic Beverage Control Act for premises where less than 50 percent of the business conducted is the sale or dispensing of alcoholic beverages shall have the burden of proving such qualification for exemption of this section to the office of the Clerk under guidelines established by the City. In order to qualify for an exemption from this section, a license or permit holder shall make application to the office of the Clerk upon annual renewal of such license or permit by the City. However, the provisions of this subsection do not apply when:
A. The underage person is an employee of the license holder, or performing a contracted service with respect to the premises.
B. The underage person is accompanied by a parent, guardian or spouse who is of legal age for the purchase of alcoholic beverages.
C. The underage person is on the premises during a time that the licensee has, in accordance with a written notice and plan given in advance to the Police Chief, suspended dispensing alcoholic beverages on the licensed premises or on a clearly delineated part of the licensed premises operated under a differentiating trade name. It shall be the strict duty of a licensee permitting such underage persons onto the licensed premises pursuant to such a plan, and of all persons employed with respect to the premises, to prevent underage persons from consuming or possessing alcoholic beverages on the premises. Police officers shall be admitted to the premises at any time to monitor compliance with all applicable laws. Failure in that duty, whether knowingly or otherwise, shall be punishable as a violation of this section.
2. It is unlawful for any person who has not yet attained the age for lawful purchase and possession of alcoholic beverages to go onto such premises as described in Subsection 1 except as provided for by Paragraphs A, B and C of said subsection.
3. Any holder of a license or permit issued pursuant to the Iowa Alcoholic Beverage Control Act which is subject to the prohibitions of this section shall post a notice on any public entrance which is not smaller than eight and one-half inches by 11 inches in bold letters not less than three inches in height that states such premises is subject to the prohibition of minors on the premises.