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Federal agents wearing hazardous material suits and breathing apparatus inspect the home and possessions in the West Hills Subdivision house of Paul Kevin Curtis in Corinth, Miss., Friday, April 19, 2013. Curtis is in custody under the suspicion of sending letters covered in ricin to the U.S. President Barack Obama and U.S. Sen. Roger Wicker, R-Miss. (AP Photo/Rogelio V. Solis)

U.S. ricin attack

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.