...some argue the U.S. should legalize marijuana, let cocaine pass through the Caribbean and take the profit motive out of the drug trade In the 40 years since U.S. President Richard Nixon declared a "war on drugs," the supply and use of drugs has not changed in any fundamental way. The only difference: a taxpayer bill of more than $1 trillion. A senior Mexican official who has spent more than two decades helping fight the government's war on drugs summed up recently what he's learned from his long career: "This war is not winnable." [] Growing numbers of Mexican and...