Figure 1. Classification Algorithm for Suspected Substance Use Disorder, or Physical or Mental Disorder

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1. Is the issue substance or alcohol related?
   1. If yes, then ask
      1. Are 2 or more DSM criteria met for a substance use disorder?
         1. If yes, then ask
            1. Is the substance on the Controlled Substances List?
               1. If yes, then
                  1. Applicant is Class A
               2. If no, then ask
                  1. Is current harmful behavior present or has there been previous harmful behavior that has been judged likely to recur?
                     1. If yes, then
                        1. Applicant is Class A
                     2. If no, then
                        1. Applicant is Class B
         2. If no, then
            1. Applicant is no class
         3. If there is insufficient information for diagnosis, then
            1. Defer for 3-6 months with an opportunity to show abstinence or obtain additional information
   2. If no, then ask
      1. Is DSM criteria met for a diagnosis?
         1. If yes, then ask
            1. Is current harmful behavior present or has there been previous harmful behavior that has been judged likely to recur?
               1. If yes, then
                  1. Applicant is Class A
               2. If no, then
                  1. Applicant is Class B
         2. If no, then
            1. Applicant is no class