Bay Area pot farming is taking a frightening new turn. A state Fish and Game warden was shot in both legs and a man was killed Friday during an early morning raid on a huge marijuana garden near Mount Umunhum in a rugged, remote area of Santa Clara County. The operation had the hallmark of aggressive Mexican drug cartels, which in recent years have cornered California's marijuana-growing market, state drug agents say."It's scary," Bob Cooke, special agent in charge of the state Bureau of Narcotics Enforcement in San Jose, said of the new trend. "Once you hit the ground, they...