A security contractor with a gun and three convictions for assault and battery was allowed on an elevator with President Obama during a Sept. 16 trip to the CDC in Atlanta. When the president left the elevator, Secret Service agents stayed behind to question the man, as he had apparently been acting strangely and refused to stop recording the president with a cell phone camera. When the agents used a national database to check his criminal history, they found his convictions. Even more shocking, when he was later questioned by a supervisor, he turned over his gun. The agents had not known he was armed, meaning the screening used to keep people with guns away from the president failed to do so.