The diverse substance abuse treatment programs which are offered to drug and alcohol addicted persons in Greenbelt, Maryland can vary in several various ways. Some drug and alcohol abuse rehabilitation programs take place in a residential or inpatient setting, where clientele remain the entire time they are in rehabilitation which offers a more therapeutic rehabilitation environment. Others provide substance abuse rehab programs on an outpatient basis which provides a sense of flexibility, although outpatient programs are not always an appropriate alcohol and drug abuse rehabilitation program for individuals in Greenbelt, Maryland who are having difficulties with serious drug or alcohol addiction problems. Whether inpatient or outpatient drug and alcohol abuse rehab programs are selected, there are varying lengths of time that people will be required to continue to be in the drug rehab program. For instance, quite a few short-term programs provide programs for 30 days or less, while long-term programs will demand at least a 12 week stay.