Haw. Rev. Stat. § 134-85: Disposal of electric gun or cartridge.

A person who is not a licensee may sell or otherwise transfer an electric gun or cartridge to a licensee or the chief of police of the appropriate county or designee. The chief of police may either destroy the electric gun or cartridge or utilize the electric gun or cartridge for educational purposes. The chief of police shall maintain records of all surrendered electric guns and cartridges, including their disposition.