In the mental health care industry, it has become the standard to refer to a person with both mental illness and a substance abuse disorder as having a Dual Diagnosis.  If not explained, one might otherwise come to the conclusion the phrase refers to a person with two co-occurring mental illnesses.  An example of co-occurring mental illnesses might be schizophrenia combined with a (major depressive) mood disorder, usually called schizoaffective disorder. Dual Diagnosis is an important term because substance abuse will complicate and [...]