I said it before on another thread -- the drug cartel issue is a bogeyman to drive other agendas.
The administration has been saying that 90 percent of the guns used in Mexican crime come from the US. The 90 percent is after subtracting 68 percent that were never submitted for tracing, Then you have to subtract the ones that were submitted, but still couldn't be traced. The real number? More like 17 percent.