Iowa Code § 804.7A
2. A federal law enforcement officer has the same authority, as provided in section 804.7, subsection 3, and has the same immunity from suit in this state as a peace officer, as defined in section 801.4, subsection 11, when making an arrest in this state for a nonfederal crime if either of the following exists:
90 Acts, ch 1014, §1
Referred to in §804.7B