Haw. Rev. Stat. § 329-129: Prohibited acts; flammable solvents.

(a) No qualifying patient, primary caregiver, qualifying out-of-state patient, or caregiver of a qualifying out-of-state patient shall use butane to extract tetrahydrocannabinol from cannabis plants.

(b) Any person who violates this section shall be guilty of a class C felony.