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Diversion of medical marijuana from legal prescriptions among teenagers is important to investigate for several reasons. The diversion of psychotropic drugs from parental and peer prescriptions is increasing (JW Psychiatry Apr 30 2007), and cannabis use during the teen years heightens the risk for psychosis (JW Psychiatry Jan 27 2005). Because many states now allow medical marijuana, researchers studied teenagers' use of marijuana diverted from legal prescriptions.
The study took place in Colorado, which houses approximately 40% of legal marijuana facilities in the U.S. and in which 2.3% of adults have registry cards for use of medical marijuana. The 164 subjects (age range, 14–18 years) from two substance-use treatment programs participated…