On Tuesday, Attorney General Eric Holder once again testified before the House Oversight Committee about revelations that officials at the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) were aware of straw buying by Mexican weapons-trafficker Manuel Barba during a several month span and that one of those weapons was discovered at the murder scene of Immigration and Customs Enforcement Agent Jaime Zapata. That weapon is allegedly linked to the disastrous Operation Fast and Furious.