Offenders are understood to be sick; the state attempts to cure them and reintroduce them into society.
"Rehabilitation" is in the NAICS Code "6243"
-- Vocational Rehabilitation Services
"Rehabilitation" is in the UNSPSC Code "42251600"
-- Rehabilitation exercise devices and equipment
Other /More definition:
Rehabilitation refers to the combined and coordinated use of social, medical, educational, and vocational measures for training or re-training individuals disabled by injury or disease so that they may regain maximum self-sufficiency and function in a normal or as near normal manner as possible. For example, rehabilitation after a stroke may help the patient speak clearly and walk again. Services include occupational therapy, physical therapy and/or speech therapy.