A dust mask and other items seized from the martial arts studio of a Mississippi man charged with sending letters laced with a deadly poison to President Barack Obama have tested positive for ricin, according to a court document released on Tuesday.
Tupelo martial arts instructor Everett Dutschke is also charged with sending poisoned letters to two other public officials.
Records seized by the FBI also showed that he ordered castor bean seeds, used to make ricin, from eBay, FBI Special Agent Stephen Thomason said in an eight-page affidavit.
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The mum wrote the emotional letter after her eight-year-old with Down's syndrome was the only child in his class not invited to a party.