U.S. ricin attack

Associated Press
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)

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Paul Kevin Curtis, the suspect arrested  for sending potentially poison-laced letters intended for President Barack Obama and Republican Sen. Roger Wicker of Mississippi, was released from jail April 22.

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