661—13.13 (17A,80) Review of application. Upon receipt of all material necessary for the appointment of a railway special agent, the division will process the application. All material will be reviewed and maintained in administrative services division headquarters’ files. The division will conduct further investigation of the applicant which may include a check of drivers’ license and motor vehicle files, criminal history data records and verification of the fact that income tax returns have been filed with the Iowa department of revenue.