Haw. Rev. Stat. § 232-21
Upon appeal, the appellate court may permit any party to introduce, or, of its own motion, may require the taking of, additional evidence material to the matter in dispute.
[L 1932 2d, c 40, §53; RL 1935, §1952; RL 1945, §5216; RL 1955, §116-18; HRS §232-21; am L 2004, c 202, §22; am L 2006, c 94, §1; am L 2010, c 109, §1]