The bodies of nine students who disappeared in southern Mexico in February have been found dismembered and dumped on a motorway alongside a bag of severed hands in what is believed to be another brutal cartel killing.... The ninth has not yet been identified.As of Tuesday( March 4), no suspects have been named, though cartel involvement has been suggested.... Mexican drug trafficking rings play a major role in the flow of cocaine, methamphetamine, heroin and marijuana, among others, between La