The 2007 probe operated out of the same ATF office that more recently ran the flawed Operation Fast and Furious. Both probes resulted in weapons disappearing across the border into Mexico, according to the emails. The 2007 probe was relatively small — involving over 200 weapons, just a dozen of which ended up in Mexico as a result of gun-walking. Fast and Furious involved over 2,000 weapons, some 1,400 of which have not been recovered and an unknown number of which wound up in Mexico.
Earlier this month, it was disclosed that the gun-walking tactic didn't begin under Obama, but was also used in 2006 under his predecessor, George W. Bush. The probe, Operation Wide Receiver, was carried out by ATF's Tucson, Ariz., office and resulted in hundreds of guns being transferred to suspected arms traffickers.