>> his devices were hideously lethal. >> pieces of wood, nails. >> that's an antipersonnel device. that's used to maim or kill. >> for almost two decades, he skillfully evaded identification and capture. >> we had literally hundreds and hundreds of suspects. >> he dropped out of sight for six years. >> people thought he was dead. >> he was obsessed about leaving fingerprint evidence. >> nobody has seen anybody like theodore kaczynski. >> the hunt for the unabomber. next. a simple sketch was almost all investigators had to go on. the facial features were distinct, but the head was