Iowa Code § 233A.12: Discharge or parole.

The director may at any time after one year’s service order the discharge or parole of any inmate as a reward for good conduct, and may, in exceptional cases, discharge or parole inmates without regard to the length of their service or conduct, when satisfied that the reasons for the discharge or parole are urgent and sufficient. If paroled upon satisfactory evidence of reformation, the order may remain in effect or terminate under rules prescribed by the director.