It is not uncommon for people who have problems with a psychological disorder to also struggle with a co-occurring alcohol and drug abuse issue. In fact, it is more common than one would imagine and a lot of individuals presently in drug and alcohol treatment facilities in Chester, California may have psychological issues which are often undiagnosed. Rehab experts at proven alcohol and drug rehab facilities in Chester know how to spot individuals with co-occurring mental and drug and alcohol abuse disorders so that these two issues can be simultaneously addressed while the person is in treatment. Due to the fact both need to be addressed, the client should not leave rehabilitation until they are mentally stable, not just abstinent.