FactCheck.org: Counting Mexico's Guns

FactCheck.org: Counting Mexico's Guns: "Counting Mexico's Guns
April 17, 2009
President Obama says 90 percent of Mexico's recovered crime guns come from the U.S. Not true.
Summary
There's no dispute that thousands of handguns, military-style rifles and other firearms are purchased in the U.S. and end up in the hands of Mexican criminals each year. It's relatively easy to buy such guns legally in Texas and other border states and to smuggle them across.

But is it true, as President Obama said, that 'More than 90 percent of the guns recovered in Mexico come from the United States?' No, it's not."