What does marijuana look like?: Drug Enforcement Agency, U.S. Government
http://www.dea.gov
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What are the methods of usage?: Drug Enforcement Agency, U.S. Government
http://www.dea.gov
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What are some consequences of marijuana use?:  Research Report Series - Marijuana Abuse: National Institute on Drug Abuse
US Department of Health and Human Services, United States Government.
http://www.dea.gov
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What to look for...?: Kevin Burns
Northwest Drug Task Force. Kalispell, Montana.
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