Beginning 7/1/2026, restricts the use of restrictive housing in state-operated and state-contracted correctional facilities, with certain specified exceptions. Establishes a restrictive housing legislative working group to develop and recommend more comprehensive laws, policies, and procedures regarding restrictive housing for members of vulnerable populations by 1/8/2027. Requires the Hawaii Correctional System Oversight Commission to review restrictive housing placements on an annual basis. Authorizes the Department of Corrections and Rehabilitation, by 12/1/2027, to implement policies and procedures recommended by the restrictive housing working group related to committed persons. Requires interim and final reports to the Legislature and Hawaii Correctional System Oversight Commission. (CD1)