U.S. ricin attack

Associated Press
This undated photo obtained from the facebook page of Paul Kevin Curtis, shows, according to neighbors, Paul Kevin Curtis, 45. Curtis was arrested Wednesday, April 17, 2013, at his home in Corinth, near the Tennessee state line. He is accused of mailing letters with suspected ricin to to national leaders. (AP Photo)

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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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