Iowa Code § 48A.6: Disqualified persons.

The following persons are disqualified from registering to vote and from voting:

1. A person who has been convicted of a felony as defined in section 701.7, or convicted of an offense classified as a felony under federal law. If the person’s rights are later restored by the governor, or by the president of the United States, the person may register to vote.

2. A person who is incompetent to vote. Certification by the clerk of the district court that any such person has been found no longer incompetent by a court shall qualify such person to again be an elector, subject to the other provisions of this chapter.