Oakland police officers arrests a man outside cannabis cultivation college Oaksterdam University during a raid by federal agents on the school in Oakland, California April 2, 2012. Federal agents raided a cannabis cultivation college on Monday in the San Francisco Bay area widely known as the "Princeton of Pot" and the "Harvard of Hemp," authorities said, as the U.S. government pressed its clamp-down on medical marijuana. REUTERS/Stephen Lam (UNITED STATES - Tags: CRIME LAW DRUGS SOCIETY)