The different substance abuse treatment services which are available to drug and alcohol addicted persons in Centreville can vary in several different ways. Quite a few drug and alcohol abuse rehab programs are conducted in a residential or inpatient setting, where individuals remain the entire time they are in rehab which supplies a more therapeutic rehab setting. Others provide alcohol and drug abuse rehabilitation programs on an outpatient basis which allows for more versatility, although outpatient programs may not be a suitable substance abuse rehab program for people in Centreville who are having difficulties with long term drug or alcohol addiction difficulties. Regardless of whether inpatient or outpatient substance abuse rehab services are selected, there are varying amounts of time that people will be asked to continue to be in the alcohol and drug rehabilitation facility. For instance, some short-term programs provide programs for a month or less, whereas long-term centers will demand at least a 12 week stay.