Iowa Code § 208A.5
The department shall enforce the provisions of this chapter by inspections, chemical analysis, or any other appropriate methods. All samples for inspection or analysis shall be taken from stocks in the state or intended for sale in the state or the department through its agents may call upon the manufacturer or distributor applying for an inspection of an antifreeze to supply such samples thereof for analysis. The department, through its agents, shall have free access by legal means during business hours to all places of business, buildings, vehicles, cars and vessels used in the manufacture, transportation, sale or storage of any antifreeze, and it may open by legal means any box, carton, parcel, or package, containing or supposed to contain any antifreeze and may take therefrom samples for analysis.
Iowa Code § 208A.5