UNDATED (CNN) -- A dust mask may link a Mississippi man to an apparent attempt to poison President Obama and other public officials. James Everett Dutschke is accused of sending ricin-tainted letters through the mail.
It is now known what led federal prosecutors to charge Dutschke in the ricin letters investigation. in an eight page affidavit, FBI agents say their surveillance team saw Dutschke remove items from the former martial arts studio he owned in tupelo and dump them in a public trash bin.
One of those items, a dust mask, tested positive for ricin. Ricin was also later found inside the martial arts studio in sink drains and on the floor.
The investigators say Dutschke ordered 100 castor bean seeds late last year, through eBay. Castor beans are used in the production of ricin, which can be deadly and has no known antidote.
Dutschke denied to investigators he purchased the beans. The FBI found publications on how to safely handle ricin and how to detect it on his computer.
Also agents say they spoke with a witness who told them Dutschke said he knows how to make a poison that could be sent to elected officials and, quote, "Whoever opened these envelopes containing the poison would die."
Dutschke denied any involvement in this YouTube video posted prior to his arrest. He says, "I met with the FBI. I consented to a search, signed a piece of paper saying go ahead and search the house. I don't have anything at all to do with this."
His lawyers have not yet commented on the information in the affidavit. The FBI says Dutschke filed a civil lawsuit against the same person the FBI identified as its witness, but it was dismissed by a Mississippi judge.
That judge, Sadie Holland, received one of the ricin laced letters. CNN spoke with Judge Holland's son, who beat Dutschke in a race for a seat in the Mississippi state House a year later. He says, "I about decided that actually I might have been the target, not my mother. But, I'm a momma's baby of extraordinary proportions and maybe he just said, what the heck if I get his momma, I've got him."
The affidavit also mentions a series of texts sent from two cell phones registered to Dutschke's wife, saying "get the fire going" and "we're coming over to burn some things," later identified as quote "my paperwork and personal things."
The FBI has not said whether any more arrests are likely in the case.
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