Associated Press
Paul Kevin Curtis, right, who had been in custody under the suspicion of sending letters which tested positive for ricin to U.S. President Barack Obama and U.S. Sen. Roger Wicker, R-Miss., and his brother Jack Curtis walk to a press conference in Oxford, Miss. on Tuesday, April 23, 2013. The charges were dismissed without prejudice, which means they could be re-instated if prosecutors so choose. (AP Photo/Oxford Eagle, Bruce Newman)

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