Iowa Code § 529.3: Investigations.

1. The attorney general or county attorney may conduct investigations within or outside this state to determine if any licensee, authorized delegate, money transmitter, or person engaged in a trade or business has failed to file a report required by this chapter or has engaged or is engaging in any act, practice, or transaction that constitutes a violation of this chapter.

2. Upon presentation of a subpoena from a prosecuting attorney, all licensees, authorized delegates, money transmitters, and financial institutions shall make their books and records available to the attorney general or county attorney or peace officer during normal business hours for inspection and examination in connection with an investigation pursuant to this section.