Article Photos: Man charged in letters case described as troubled 2/13

A Prince George's County, Md. firefighter dressed in a protective suit walks into a government mail screening facility in Hyattsville, Md., Wednesday, April 17, 2013. Police swept across the U.S. Capitol complex to chase a flurry of reports of suspicious packages and envelopes Wednesday after preliminary tests indicated poisonous ricin in two letters sent to President Barack Obama and a Mississippi senator.  (AP Photo/Alex Brandon)