Amends the Unified Code of Corrections. Provides that, 2 years after the effective date of the amendatory Act, the Department of Juvenile Justice shall exercise control and supervision of all county detention centers in the State. Provides that the Department shall adopt rules to close all juvenile detention centers in the State and shall establish a rehabilitation program for minors adjudicated delinquent which must be completed before the completion of their sentence. Amends the Juvenile Court Act of 1987. Provides that after the closure of all juvenile detention centers in the State and the establishment of the rehabilitation program by the Department, every minor committed to the Department must successfully complete a rehabilitation program established by the Department. Provides that the failure of the minor to successfully complete the program shall result in the minor remaining in custody of the Department until the minor's 21st birthday. Amends various Acts to make conforming changes. Effective immediately.