Haw. Rev. Stat. § 390-4: Suspension, revocation, invalidation of certificate.

The director may suspend, revoke or invalidate any certificate of employment or age if in the director's judgment it was improperly issued, the minor is illegally employed, or the nature or condition of employment is such as to injuriously affect the health, safety or well-being of the minor or contribute toward the minor's delinquency.