And I'm glad they are checking up on dealers in the border area, cross gun sales from the US into Mexico is a big problem.
Actually, only a very small number of licensed dealers have been singled out and investigated concerning illegal sales. A lot of guns were and are obtained by straw buyers that have clean records, and easily pass background checks. Unless they are involved in a large number of buys the straw buyers are seldom prosecuted at the federal level.
Gunrunners obtain a substantial number of firearms by burglarizing or robbing gun stores or private homes, and for some unknown reason don’t bother to fill out any paperwork. Critics often point a bony finger at border area gun shows, but the fact of the matter is that these shows are heavily surveillance by law enforcement from many agencies, and from all levels of government. Stories in the mainstream media about sales of full-automatic weapons, rocket launchers, grenades and other military equipment of a similar nature are obviously pure bull droppings.
It should also be noted that gunrunning is frequently associated with drug smuggling, with guns going south and drugs coming north.
Also for reasons that should be clear, local BATF&E spokespersons tend to exaggerate the circumstances in their own self-interest, when reporters, none of which are bright enough to understand they are being taken on a ride, interview them - and of course they prefer anti-gun sensationalism any way they can get it.
There is a problem of course, but the Mexican drug cartels have more then enough financial resources to obtain military class firearms from many sources, and in any quantity they want.
How do I know? Because I live near the border, and have for many years.