Haw. Rev. Stat. § 52D-5
The chief of police of each county and any duly authorized subordinates shall have and may exercise all powers, privileges, and authority necessary to enforce the laws of the State, in a county other than the county in and for which the chief has been appointed, if:
[L 1989, c 136, pt of §2]
Mutual Aid and Maunakea: Policing Protests Post-Flores. 45 UH L. Rev. 233 (2022).