It is not uncommon for people who have problems with a psychological disorder to also have a co-occurring alcohol and drug abuse issue. In fact, it is more widespread than one would assume and many individuals presently in alcohol and drug rehabilitation centers in San Mateo, California may have psychological issues which are often undiagnosed. Rehabilitation professionals at proven drug treatment programs in San Mateo, CA. know how to identify persons with co-occurring psychological and alcohol and drug abuse disorders in hopes that both concerns can be handled simultaneously while the individual is in rehabilitation. Because both need to be addressed, the client must remain in rehabilitation until they are psychologically stable, not just sober.