HRS §52D-5
Police chief powers in other counties
This section lets a county's police chief and their authorized officers enforce state laws in another county. They can do this only when chasing an investigation that started in their own county and the other county's police chief agrees.
courts
The statute, as written — Powers of chief of police outside own county
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: (1) The exercise of such power, privilege, and authority is required in the pursuit of any investigation commenced within the county in and for which the chief has been appointed; and (2) The concurrence of the chief of police of the county in which the power, privilege, and authority sought to be exercised is obtained.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.