It has been shown that people with mental disorders are more likely to also have a substance abuse disorder, and the more severe the mental disorder, the more likely it is to have an accompanying substance abuse disorder. The more common severe mental illnesses with the highest levels of substance abuse attachment are depression, bipolar disorder, and schizophrenia. Substance abuse makes treating the illnesses harder, so it is important for a therapist to know whether or not a substance abuse disorder exists in their patients. To that effect, Sarah L. Desmarais performed a test to see if there is a superior method of those available to determine substance abuse in adults with schizophrenia.
Read the full article here: Diagnosing Substance Abuse and Dependence in Schizophrenia