Iowa Code § 455B.394: Right of entry.

A person shall not refuse entry or access to, or harass or obstruct an authorized representative of the department who seeks entry or access for the purpose of investigating or responding to a hazardous condition. The representative shall present appropriate credentials. Upon a showing of probable cause in writing and made under oath, a judge or magistrate having proper jurisdiction shall issue a suitably restricted search warrant to the representative of the department for the purposes of enabling the representative to investigate or respond to a hazardous condition.