She said the FBI is pursuing DNA from "numerous individuals" in the investigation, but declined to give details on the others.
The U.S. Marshals Service is currently auctioning off items seized from Kaczynski's home. Ahead of that auction, he filed a motion asking California courts to order the government to keep certain items seized from his cabin in 1996, including journals that could prove his whereabouts in 1982 and other evidence that could clear him in the Tylenol case.
The Tylenol case involved the use of potassium cyanide and resulted in a mass recall. Kaczynski said he has "never even possessed any potassium cyanide."
In a space of three days beginning Sept. 29, 1982, seven people who took cyanide-laced Tylenol in Chicago and four suburbs died. The deaths triggered a national scare and a huge recall, and eventually led to the widespread adoption of tamperproof packaging for over-the-counter drugs.
In 2009, federal agents searched the Boston home of James W. Lewis, who served more than 12 years in prison for sending an extortion note to Tylenol maker Johnson & Johnson demanding $1 million to "stop the killing." Lewis has denied being involved in the poisonings.
No charges have ever been filed in the deaths.