so it's pretty complex, and it's very dynamic. >> host: to calls for, i guess, david silverberg of homeland security, he's the founding editor. this is ron on the independent line. go ahead. >> caller: yes. i had a question about the contraband that comes from the u.s. down, and how do they get the guns across from fast and furious? were the border agents told to let these guys on or how did that work? >> guest: well, with fast and furious, the questions about it not the border control, but the atf, the bureau of alcohol, tobacco, firearms and explosives allowed a certain number of guns, about 2,000 from what i understand, to go into mexico so that they could trace these guns. and the problem was that they lost track of some of these guns, and one of these guns was used to kill a u.s. border patrol agent which in a terrible, terrible way showed the success of fast and furious. and it proved that this smuggling of guns was not only being used to subvert the mexican government and the forces of law and order there, it was coming back to the united states and subverting our own law enforcement