Iowa Code § 684A.1: Power to answer.

The supreme court may answer questions of law certified to it by the supreme court of the United States, a court of appeals of the United States, a United States district court or the highest appellate court or the intermediate appellate court of another state, when requested by the certifying court, if there are involved in a proceeding before it questions of law of this state which may be determinative of the cause then pending in the certifying court and as to which it appears to the certifying court there is no controlling precedent in the decisions of the appellate courts of this state.