Mexican authorities have seized over 100,000 guns in its ongoing drug war with the drug cartels. Of this amount 20,000 guns were sent to the United States Bureau of Alcohol, Tobacco and Firearms. 18,000 of these guns were manufactured, imported, or sold in the United States.
However, only 7,900 of these guns, or 44 percent, were traced back to a federally licensed dealer. These rest are believed to have either been sold at gun shows where a background check is not required.