The study site lay within the 80 ha minimum-security Waiawa Correctional
Facility, which is situated in the Waipio-Ewa area of Oahu on the southwest
(leeward) slope of the Koolau Mountain Range (lat 21◦30 N, long 157◦50 W).
The elevation was 260 m above sea level and the land was flat to very gently
sloping