USA Today:
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Although the directive issued by Attorney General Eric Holder will apply nationwide, it will largely affect the 20 states and the District of Columbia that allow for medical marijuana use, and Colorado and Washington where state laws allow medical and recreational use by adults.
- the distribution of marijuana to minors;
- revenue from the sale of marijuana from going to criminal enterprises, gangs and cartels;
- the diversion of marijuana from states where it is legal under state law in some form to other states;
- state-authorized marijuana activity from being used as a cover or pretext for the trafficking of other illegal drugs or other illegal activity;
- violence and the use of firearms in the cultivation and distribution of marijuana
- drugged driving and the exacerbation of other adverse public health consequences associated with marijuana use;
- growing of marijuana on public lands and the attendant public safety and environmental dangers posed by marijuana production on public lands;
- preventing marijuana possession or use on federal property.