More news tonight about the Mississippi man arrested in the ricin letter case: Feds Finds Ricin Traces at Miss. Suspect’s Dojo.

A dust mask allegedly discarded by the man accused of sending ricin-laced letters to President Obama and Sen. Roger Wicker (R-Miss.) tested positive for the poison, according to a court document made public on Tuesday.

After James Everett Dutschke stopped by his former martial arts school in Mississippi last week, a government surveillance team observed him throw a box of latex gloves, the packaging for a coffee grinder, and a dust mask into a public garbage bin, according to an affidavit given by an FBI special agent.

The mask later tested positive for ricin, as did a liquid sample taken from the drain in the martial arts dojo’s sink, two swabs taken from inside the school, and items that had been vacuumed from the floor of the dojo, according to the affidavit.

[…]

Last week, federal agents allegedly got records that showed Dutschke used a Paypal account to make two purchases of castor beans through Ebay’s website late last year, according to the affidavit.