FILE – In an April 4, 1996 file photo, former University of California at Berkley math professor Theodore John Kaczynski is escorted into the federal courthouse in Helena, Mont. The FBI says it’s investigating whether Unabomber Ted Kaczynski was involved in the 1982 Chicago-area Tylenol poisonings case that killed seven people. Chicago FBI spokeswoman Cynthia Yates confirmed Thursday, May 19, 2011 that the agency has asked for Kaczynski’s DNA. (AP Photo/Elaine Thompson, File)