In December of 2009, a Nigerian man tried to ignite an explosive device located in his underwear aboard a trans-Atlantic Northwest Airlines flight bound for Detroit. The attempt failed, the bomber hurt only himself, later pled guilty, and will spend the rest of his life in prison.

That said, the attempt raised the questions: Why didn't Umar Farouk Abdulmutallab make it to the Terrorist Watchlist despite warnings before his bombing attempt?

Eileen Larence, director of homeland security and justice issues at the Government Accountability Office, discussed a new study on the issue with Capital Insider.