Medical Marijuana

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Colorado residents who use marijuana legally under a state medical program can be prosecuted by federal authorities. That's according to a ruling Monday morning by the U.S. Supreme Court.

In a six-to-three ruling in a case from California, justices say state medical marijuana laws don't protect users from the federal ban on the drug.

Colorado is one of ten states that allow the use of marijuana to treat various illnesses, as long as a doctor prescribes it. Writing for the majority, Justice John Paul Stevens says Congress could change the law.

In a dissenting opinion, Justice Sandra Day O'Connor says states should be allowed to set their own rules. She says the court is overreaching.