In Iowa, the Division of Criminal Investigations ("DCI") is a division of the Iowa Department of Public Safety. The Commissioner of the Iowa Department of Public Safety is Stephan Bayens (appointed by Reynolds).
Department of Public Safety (DPS):
https://dps.iowa.gov/divisions/commissioners-office/commissioner-bayens
DCI's Special Enforcement Operations Bureau is charged with oversight and investigations of gaming activity.
https://dps.iowa.gov/divisions/crim...nt-operations/gambling-enforcement-activities
DCI is not a division of the Attorney General's office. The Attorney General is the head of the Iowa Department of Justice.
https://www.iowaattorneygeneral.gov/about-us/divisions
Thus, as much as I dislike Brenna Bird and feel as though she is an empty suit, it is incorrect to conclude that she oversees DPS or DCI. In fact, if it is determined that agents in the DCI or DPS went "rogue," acted without authority and committed crimes, Brenna Bird's office would be charged with the responsibility of prosecuting the crimes.
An organizational chart for anyone interested:
http://publications.iowa.gov/19530/1/StateOrganizationalStructure.pdf