Mexican and U.S. lawmakers called for investigations . Tensions stemming from law enforcement actions have long troubled relations between Mexico and the United States . Allegations that the FBI used agents to steal money , perhaps even on Mexican soil . Mexican Sen. Felipe Gonzalez : ` ` You ca n't fight crime by committing criminal acts '' A former DEA agent says infiltration of Mexican drug cartels is essential .
Mexican and U.S. lawmakers called for investigations . Allegations that the FBI used agents to steal money , perhaps even on Mexican soil . Mexican Sen. Felipe Gonzalez : ` ` You ca n't fight crime by committing criminal acts '' A former DEA agent says infiltration of Mexican drug cartels is essential .