Unabomber Theodore "Ted" Kaczynski probed in 1982 Tylenol poisonings

(CBS/KOVR/AP) CHICAGO - One of Ted Kaczynski's original attorneys isn't shocked the FBI is questioning whether his former client is connected to the 1982 Tylenol poisonings that killed seven people in the Chicago area.

"He certainly has the...know-how to come up with that kind of method of doing away with people," Robert Blaiser told CBS affiliate KOVR.

Kaczynski wrote in court papers filed in federal court in California last week that prison officials passed along an FBI request for DNA samples.

Kaczynski is serving a life sentence after pleading guilty in 1998 to setting 16 explosions that killed three people.

Chicago FBI spokeswoman Cynthia Yates confirmed Thursday that the agency has asked for Kaczynski's DNA. She says he's refused to voluntarily give a sample but declined to say whether the agency could compel him to provide one.

The Tylenol case involved the use of potassium cyanide and led to a mass recall by manufacturer Johnson & Johnson. Kaczynski says he has never possessed potassium cyanide.