Witnesses, if in the employ of the state, shall not be entitled to any witness fees, but shall receive the mileage allowed witnesses in the district court. Other witnesses shall receive the fees and mileage allowed witnesses in district court. A sum sufficient to pay the fees and mileage is appropriated out of any unappropriated funds in the state treasury.
Iowa Code § 66.28
2019 Acts, ch 24, § 12
Witness fees, §622.69 - 622.75