The different substance abuse rehabilitation services which are offered to drug addicted persons in Greenville, MS. can differ in many different ways. Some drug and alcohol abuse rehabilitation services are conducted in a residential or inpatient location, where clients remain the entire time they are in rehab which offers a more conducive treatment environment. Others provide substance abuse rehabilitation services on an outpatient basis which allows for more versatility, though outpatient centers may not be a suitable alcohol and drug abuse treatment program for people in Greenville, MS. who are struggling with long term addiction issues. Regardless of whether inpatient or outpatient drug and alcohol abuse rehabilitation programs are selected, there are also different lengths of time that individuals will be required to stay in the drug rehabilitation program. For instance, quite a few short-term programs offer programs for 4 weeks or less, whereas long-term facilities will call for at least a 90 day stay.