Efforts to stem the smuggling of weapons from the United States to Mexican drug cartels have been frustrated by bureaucratic infighting, a lack of training and the delayed delivery of a computer program to Mexico, according to U.S. and Mexican officials, The Washington Post reports.

In the past four years, Mexico has submitted information about more than 74,000 guns seized south of the border that the government suspects were smuggled from the United States. But much of the data is so incomplete as to be useless and has not helped authorities bust the gunrunners who supply the Mexican mafias with their vast armories, officials said.

According to U.S. agents working there, Mexican prosecutors have not made a single major arms trafficking case.

In an address before a joint session of Congress this year, President Felipe Calderon asked the United States to reimpose a ban on the assault-style rifles favored by Mexican drug cartels and to work harder to stop weapons flowing from gun shops and gun shows along the southwest border into Mexico.

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