The El Paso Times reports that Mexican authorities have only provided ATF with serial numbers for less than a third of the weapons that were seized since 2006 when the crackdown against the drug cartels began. The article asserts that Mexican authorities handpicked which firearms were traced. One skeptic said that most of the seized firearms were not traced because of corruption in Mexico. Regardless whether that claim is true, ATF says that the firearms that have been successfully traced were on average originally sold at retail about 14 years ago. That a high percentage of firearms successfully traced turn out to have been sold in the United States should come as no surprise since federal law requires markings on firearms so they can be traced through interstate commerce. It is like tracing cars on a Ford dealership and finding out they are mostly Ford vehicles.