It's a mystery that this documentary speaks little to nothing about linguistics analysis at all. Forensic linguistics played an important role in providing the basis of the search warrant. It might haven't been the sole method, but it was crucial considering the Unabomber's means of communication was letters or other written texts. I sense that the role of linguistic analysis was deliberately dismissed in this documentary, for whatever reason. Too bad. It's like you are served with salad without any dressing.