Restricts the use of solitary confinement in state-operated and state-contracted correctional facilities, with certain specified exceptions. Requires the Department of Corrections and Rehabilitation to develop written policies and procedures regarding solitary confinement by 7/1/2026. Requires the Hawaii Correctional System Oversight Commission to review certain housing placements. Requires the Department to develop policies and procedures to review committed persons placed in solitary confinement and develop a plan for committed persons currently in solitary confinement by 4/1/2026. Requires a report to the Legislature and Hawaii Correctional System Oversight Commission. Effective 7/1/2026.