Timeline: Ricin Letters Investigated

Ricin letters
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., on Friday. Curtis had been in custody under the suspicion of sending letters covered in ricin to U.S. President Barack Obama and U.S. Sen. Roger Wicker, R-Miss., but was released Tuesday. (AP Photo/Rogelio V. Solis)
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