High Quality Content by WIKIPEDIA articles! A residential treatment center (RTC) sometimes called rehab, is a live-in facility providing therapy for substance abuse, mental illness, or other behavioral problems. Residential treatment should, in many cases, be considered the "last-ditch" approach to helping a child with severe problems. RTCs for adolescents provide behavior modification for patients who present a variety of conditions, ranging from drug abuse to violence to sexual behavioral problems. Different RTCs work with different grades of problems, and so the structure and methods of RTCs varies. Some RTCs are lock-down facilities; that is, the residents are locked inside the premises; however, other RTCs don't lock the residents in. There are generally two types of residential treatment centers: locked and unlocked. In a locked residential treatment facility, patients movements are severely restricted, usually to a single room or cell.