It is not uncommon for individuals who have problems with a psychological disorder to also have a co-occurring substance abuse issue. Frankly, it is more common than one would assume and quite a few people presently in drug rehabilitation facilities in Quincy, California may have psychological disorders which have just simply been undiagnosed. Rehabilitation specialists at effective alcohol and drug rehab centers in Quincy know how to identify persons with co-occurring mental and drug and alcohol abuse issues so that both issues can be simultaneously addressed while the individual is in treatment. Due to the fact both must be resolved, the client should not leave treatment until they are mentally stable, not just abstinent.