 In February 1996 , Bisceglie provided a copy of the 1971 essay written by Ted Kaczynski to the FBI . At the UNABOM Task Force headquarters in San Francisco , Supervisory Special Agent Joel Moss immediately recognized similarities in the writings . Linguistic analysis determined that the author of the essay papers and the manifesto were almost certainly the same . When combined with facts gleaned from the bombings and Kaczynski 's life , that analysis provided the basis for a search warrant . 
