There are seven thousand arms dealers within a few hours’ drive of the Mexican border. That’s three a mile. Most of those guns aren’t going to shoot deer in Minnesota. Now Keller sits across the street from one of them, in Scottsdale, Arizona, and watches the straw purchaser go in. The Mexican government claims that 90 percent of the weapons used by the cartels come from the United States, but Keller knows that isn’t true. Most of the weapons the cartels use are looted from the armories of Central American military, but the gun stores that line the border are there for a reason, just like the
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