Haw. Rev. Stat. § 440-31: Persons barred as amateur contestants.

No person shall appear as a contestant in amateur boxing contests who prior thereto has received any compensation or monetary reward in any form for displaying, exercising, or giving any example of the person's boxing skill or for rendering services to any athletic organization or to any person or persons as a boxing trainer, coach, instructor, or otherwise, or who has been employed in any manner professionally by reason of the person's boxing skill or knowledge.