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Indoor cultivation requires nearly nonstop use of lights and various heating, ventilation and air conditioning systems.

States legalizing cannabis so far have done little to limit or even track the huge amounts of energy needed to grow it indoors. Read more»

The Arizona Supreme Court ruled Tuesday that state law protects the manufacture and use of cannabis concentrates, not just the plant itself. Read more»

The United Nations has reprimanded Latin American countries that have decriminalized narcotic use, delivering a blow to the growing movement looking for a change in drug policy. It says it is particularly concerned by a 2009 law in Mexico that decriminalizes possession of small amounts of cannabis, cocaine, heroin and other drugs. Read more»