Despite the fact that cultivation of cannabis remains a federal offense, a new generation of "ganja-preneurs" hopes to cash in on the growing market for medical marijuana. In California, the Green Rush is in full bloom as growers, dispensaries, hydroponic nurseries, testing labs and insurance companies fight for a piece of this irresistible economic brownie. Marijuana Gold Rush enters the brave new business world of pot ? where Manhattan execs have joined forces with old-school growers in Northern California to explore the real potential of this budding industry.