Mexico's Gun Supply and the 90 Percent MythAs we discussed in a previous analysis, the 90 percent number was derived from a June 2009 U.S. Government Accountability Office (GAO) report to Congress on U.S. efforts to combat arms trafficking to Mexico (see external link).
According to the GAO report, some 30,000 firearms were seized from criminals by Mexican authorities in 2008. Of these 30,000 firearms, information pertaining to 7,200 of them (24 percent) was submitted to the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) for tracing. Of these 7,200 guns, only about 4,000 could be traced by the ATF, and of these 4,000, some 3,480 (87 percent) were shown to have come from the United States. Mexico's Gun Supply and the 90 Percent Myth
This means that the 87 percent figure relates to the number of weapons submitted by the Mexican government to the ATF that could be successfully traced and not from the total number of weapons seized by Mexican authorities or even from the total number of weapons submitted to the ATF for tracing. In fact, the 3,480 guns positively traced to the United States equals less than 12 percent of the total arms seized in Mexico in 2008 and less than 48 percent of all those submitted by the Mexican government to the ATF for tracing. This means that almost 90 percent of the guns seized in Mexico in 2008 were not traced back to the United States.
The Mexican government submitted those guns to the ATF that the Mexican Government thought probably came from the US. All the other guns that obviously came from elsewhere, like from the Mexican army, were not submitted because their origin was already known to be not the US.