How do you square the trend toward legalization of marijuana with the Fourth Amendment?

English: Leaf of Cannabis עברית: עלה של קנביס (Photo credit: Wikipedia)

Herewith a thoughtful article on that issue:
http://verdict.justia.com/2014/06/02/marijuana-legalization-regimes-evolving-fourth-amendment

In Colorado, most universities have banned marijuana use on their campuses, despite its legalization.  But what to do about violators?  Is pot smoking now no more serious a violation than underaged drinking among the students?

What about states where medicinal use is legitimate?  I suppose you treat marijuana like any other prescription drug.  

The DOJ says it will not enforce the federal law to the extent a particular state has legalized marijuana.  But what if a federal officer acts on his/her own?

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