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None of the possibly ricin-tainted letters mailed to President Obama have reached the White House, authorities say. They were intercepted at a remote mail handling facility. Larry Downing /Reuters /Landov hide caption

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Larry Downing /Reuters /Landov

Everett Dutschke, right, talks with a federal agent near the site of a martial arts studio he once operated in Tupelo Wednesday. Dutschke faces federal charges accusing him of sending ricin-laced letters to President Obama and others. Rogelio V. Solis/AP hide caption

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Rogelio V. Solis/AP

A screen image from a video on the YouTube channel where Paul Kevin Curtis has posted clips of his performances — in this case, as "Elvis." YouTube.com hide caption

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The bean of the castor-oil plant, Ricinus communis, is used in the production of castor vegetable oil and ricin, a poison. Sasha Vasko/via Flickr hide caption

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Sasha Vasko/via Flickr