I agree with David -- we would need to know more about what you're looking for. There are validated scales for depression (Beck, Hamilton), anxiety (Spielberger), addiction (MAST, DAST) etc. Once you figure out the constructs you're looking for, you can find the measures.
Check out SCL90-R. Gives a general overview and subscales. You can see in the overview how many answers have been marked positive and their intensity as well. Another one is the Brief Symptom Inventory. But I have no experience with that one. May be it can be obtained for free in the Internet.
What do you want to measure? Detection? Results? There have already been good sugestions of scales for detection. Concerning outcomes ,I would suggest quality of life. Try whooqol, from WHO. Open access.
The Warwick-Edinburgh Mental Well-being Scale (WEMWBS) measures positive mental health and has been used in prison populations, clinical samples, males, females, adults of working age and older people. It comprises 14 positively-phrased statements and uses a Likert scale. It is a self-report tool and has been adapted and validated for use in other countries. In England the shorter version is used at intervals with individual patients from the point of entering a community mental health service and throughout treatment.