It is not uncommon for individuals who have problems with a psychological issue to also have a co-occurring substance abuse disorder. In fact, it is more prevalent than one would assume and a lot of people presently in drug and alcohol rehabilitation centers in Glenn, California may have psychological disorders which are often undiagnosed. Rehab specialists at successful alcohol and drug rehabilitation programs in Glenn know how to identify individuals with co-occurring mental and substance abuse disorders so that both issues can be handled simultaneously while the person is in treatment. Simply because both must be resolved, the person must remain in rehab until they are psychologically stable, not just sober.