What factors would you look for in differentiating a mental health disorder from substance abuse?

An issue that is shared by the mental health, medical, and criminal justice fields involves differentiating substance abuse disorders from other Axis I mental health disorders. Identify at least two journal articles that address this topic. How might substance use/abuse mimic another mental illness? Include the substances and potential symptoms. What factors would you look for in differentiating a mental health disorder from substance abuse? How would you go about assessing and determining an accurate diagnosis for the client?