It is quite common for people who struggle with a psychological issue to also have a co-occurring drug and alcohol abuse disorder. In fact, it is more common than one would imagine and a lot of individuals presently in alcohol and drug treatment centers in Pomona, California may have psychological issues which have just simply been undiagnosed. Treatment professionals at successful drug rehab programs in Pomona know how to identify persons with co-occurring mental and substance abuse disorders in hopes that these two issues can be handled simultaneously while the person is in rehab. Because both must be resolved, the client should not leave rehab until they are mentally stable, not just abstinent.