On Sunday, two Afghan troops were killed when their car hit a roadside bomb in Kandahar Province. Improvised explosive devices continue to plague the U.S.-led military coalition. This year alone, the death toll stands at 237 international service members including 168 Americans.

The Government Accountability Office recently completed a study on how U.S. Agencies detect and prevent calcium ammonium nitrate (CAO is a key IED ingredient) from making it's way into Afghanistan.

Charles Johnson, GAO's director of international affairs and trade issues, discussed the review with Capital Insider.