Private security firm bought weapons on Iraqi black market

An investigation by T. Christian Miller and Aram Roston for ProPublica shows that Triple Canopy, the top private security contractor in Iraq, "swapped booze for weapons and supplies from the U.S. military" and purchased arms on the Iraqi black market.  Previously undisclosed documents reviewed by ProPublica point to continued difficulties for the by the U.S government with effective oversight of private contractors in war zones.