atf examiner greg klees examined the extrusion marks made on the plastic insulation as it squeezed throughhe dye during the manufacturing process. this process makes the wire its uniform size. >> those marks will be imparted on that plastic insulation for a number of feet before it changes dramatically. >> lined up on a comparison microscope, it was no doubt. the wire from both bomb sites came from the same source. >> in fact, that these were produced on the same forming dye at the same plant. >> they also discovered both bombs used the same blue and the same cotton string. since both bombs appeared to be made by the same individual, this eliminated jimmy morris and phil ryan. they both had solid alibis for the second bombing. but why did these boys implicate themselves in the first place? >> they offered an explanation that they were doing this because they were playing this dungeons and dragons game. >> they really spent a lot of time wasting the time of investigators. >> i thought that was an incredibly stupid thing to do. >> then a witness came forward saying she'd seen a white male wa