FILE - In this Oct. 7, 1982 file photo, employees of the Chicago City Health Department test Tylenol medication for the presence of deadly cyanide at the department's lab. The Chicago FBI confirmed Thursday, May 19, 2011, that the agency has asked for the DNA from Unabomber Ted Kaczynski in an investigation to see if he may have been involved in the 1982 Tylenol poisonings that killed seven people in the Chicago area. The Tylenol case involved the use of potassium cyanide and resulted in a mass recall. (AP Photo/Charlie Knoblock, File)