The testimony came yesterday during a preliminary hearing for James Everett Dutschke, 41, who was arrested Saturday and charged with making ricin, the same substance mailed on April 8 to Obama, US Senator Roger Wicker and Mississippi judge Sadie Holland.
Magistrate Judge S Allan Alexander ruled that there was enough probable cause to send the case to a grand jury.
Dutschke's lawyer George Lucas waived a detention hearing but reserved the right to ask for one later.
FBI agent Stephen Thomason said on April 22, agents saw Dutschke go to his former martial arts studio in Mississippi and then throw items in a trash can down the street.
One of those items was a dust mask that tested positive for ricin, he said.
Thomason said the mask had DNA from two people on it.
He said Dustchke was the "major contributor." The agent did not say who else's DNA was on it.
Dutschke is second person to be charged in the case.
The first suspect, Elvis impersonator Paul Kevin Curtis, 45, was arrested on April 17, but the charges were dropped six days later.
Curtis said he knows Dutschke and they feuded over the years.
No possible motive was discussed at yesterday's hearing.
Much of Thomason's testimony was from an FBI affidavit made public earlier this week, which said trace amounts of ricin was found in Dutschke's former martial arts studio.
Thomason said Dutschke used the Internet to make three purchases of castor beans, from which ricin is derived.
The affidavit had said two, but Thomason said the investigation turned up another.
A Senate official has said the ricin was not weaponised, meaning it wasn't in a form that could easily enter the body. If inhaled, ricin can cause respiratory failure, among other symptoms. No antidote exists.
Dutschke faces up to life in prison if convicted in the ricin case. He's also facing unrelated charges of child molestation.
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