The move by Mexico to allow the transfer of Rafael Caro Quintero to the United States signaled a potentially new era of cooperation in the drug war.

Rafael Caro Quintero was arraigned on multiple drug and weapons offenses in Brooklyn federal court following his extradition Thursday to the U.S. from Mexico.

After years as one of U.S. authorities' most wanted men, Mexican drug cartel boss Rafael Caro Quintero was brought into a New York courtroom Friday to answer charges that include orchestrating the 1985 killing of a U.