December 30, 2007 - Eleven years ago, California became the first of a dozen states in the nation to legalize medical marijuana. True believers, including many doctors, say pot works to ease pain or counter the side effects of chemotherapy. And the National Academy of Sciences agrees, if the drug is carefully used. Critics see medical use as the gateway to legalizing all marijuana. Well, how is the California state law working? As correspondent Morley Safer reports, the answer involves another statute: the law of unintended consequences
