SAN FRANCISCO -- Marijuana advocate Ed Rosenthal was convicted for a second time today of violating federal drug laws by growing pot plants for medical patients, but he faces no punishment for the felony convictions, apart from the one day in jail that he has already served. Rosenthal, 62, of Oakland, a well-known authority on cannabis cultivation, former columnist for High Times magazine and author of a recent book calling for legalization of marijuana, was convicted by a federal jury in San Francisco of three charges of illegal cultivation and conspiracy after a day of deliberations. He was acquitted of...