Iowa Code § 125.40

1. No county or city may adopt or enforce a local law, ordinance, resolution or rule having the force of law in contravention of the provisions of this chapter.

2. No county or city may interpret or apply any law of general application to circumvent the provision of subsection 1.

3. Nothing in this chapter affects any law, ordinance, resolution or rule against drunken driving, driving under the influence of alcohol or other chemical substance, or other similar offense involving the operation of a vehicle, aircraft, boat, machinery or other equipment, or regarding the sale, purchase, dispensing, possessing or use of alcoholic beverages or beer at stated times and places or by a particular class of persons or regarding the sale, purchase, possession or use of another chemical substance.

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