29 Held in Ring's Drug Smuggling From Mexico to New York
Federal law enforcement officials announce arrest of 29 suspected members of Mexico's most powerful drug trafficking syndicate; say syndicate, once headed by late Amado Carrillo Fuentes, trucked tons of cocaine and marijuana to New York City and carried back millions of dollars in illegal drug profits; say arrests highlight latest strategic shift by Mexican drug barons, who have graduated from transporting cocaine and heroin for Colombians to distributing much of drugs themselves (M)