Prince George's County, Md. Police Chief Mark Magaw speaks at a news conference at the Prince George's County Police Headquarters in Palmer Park, Md., on Friday, July 27, 2012. to talk about a suspect who police 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)
