Here's an interesting detail about the much-publicized recent arrest of Mexico's top drug baron Edgar Valdez Villarreal, better known as "La Barbie'' -- he was caught with a U.S.-made M-16 semiautomatic rifle and other sophisticated arms that Mexican officials suspect were smuggled from the United States.
In Mexico, U.S. arms smuggling is a big issue. President Felipe Calderón said during a visit to Washington in May that of all the guns and assault rifles seized in Mexico over the past three years, "more than 80 percent of those we have been able to trace came from the United States.''
