Iowa Code § 177A.14: Right of access.

The state entomologist and the entomologist’s authorized inspectors, employees, and agents shall have free access within reasonable hours to any farm, field, orchard, nursery, greenhouse, garden, elevator, seedhouse, warehouse, building, cellar, freight or express office or car, freight yard, truck, automobile, aircraft, wagon, vehicle, carrier, vessel, boat, container or any place which it may be necessary or desirable for such authorized agents to enter in carrying out the provisions of this chapter. It shall be unlawful to deny such access to such authorized agents or to hinder, thwart, or defeat such inspection or entrance by misrepresentation or concealment of facts or conditions, or otherwise.