Prince George's County Police Chief Mark Magaw listens at left as Ashan Benedict, Assistant Special Agent In Charge with the Baltimore ATF, speaks at a news conference at the Prince George's County, Md. Police Headquarters in Palmer Park, Md., Friday, July 27, 2012, to discuss a suspect who they say was plotting a shooting in his workplace. Police in Maryland say a man who called himself "a joker" and threatened to shoot up his workplace was in the process of being fired. Police say the 28-year-old man was taken into custody Friday morning. Investigators said he was wearing a T-shirt that said "Guns don't kill people. I do." He was taken into custody for an emergency mental health evaluation and charges are pending. (AP Photo/Jacquelyn Martin)