Iowa Code § 622.54: Of a justice of the peace.

The official certificate of a justice of the peace of any of the United States to any judgment and the preliminary proceedings before the justice of the peace, supported by the official certificate of the clerk of any court of record within the county in which such justice resides, stating that the justice is an acting justice of the peace of that county, and that the signature to the justice’s certificate is genuine, is sufficient evidence of such proceedings and judgment.