(CNN) -- A dust mask linked to 41-year-old Mississippi man James Everett Dutschke, among other samples, tested positive for ricin, according to an affidavit in support of a criminal complaint unsealed Tuesday.
Federal authorities arrested Dutschke on Saturday on charges of possessing and using ricin in connection with letters sent to, among others, President Barack Obama.
Dutschke was taken into custody after authorities initially charged -- and then cleared -- Paul Kevin Curtis, another Mississippi man with whom he has sometimes feuded.
A preliminary hearing in Dutschke's case is set for Thursday.
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