Under a grant of immunity from prosecution, the authors tested 100 student drug users and 100 nonusers, who also had immunity. They categorized the drug users as marijuana-only users, multiple-drug users, or gross-multiple-drug users. Using the Minnesota Multiphasic Personality Inventory as a criterion, they found that the gross-multiple users had the highest incidence of abnormal profiles and that they, as well as the multiple users, evidenced more psychopathology than the marijuana-only users or the nonusers.
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