Mental illness and substance use disorders individually comprise a challenging area of work for health care professionals. In combination, these issues create an even greater demand; a demand that many health care professionals find themselves ill prepared to address (McKeown, 2010). The prevalence rates of substance disorders and psychiatric disorders co-occurring in one person, a condition referred to as dual diagnosis, are astoundingly high.
Delgado, K. J.
(2010). Dual Diagnosis: Impact, Assessment, and Treatment in Co-occurring Substance Abuse and Severe Mental Illness. .