anything to do with this or not, to know that that had been plotted behind my back hurt. it hurt. >> did it make you think maybe he could have been behind this? it's made me have a lot of questions. >> while any case against darin would have been purely circumstantial, that didn't explain why doug mulder hadn't fended off some of the circumstantial evidence against darlie, who was facing death row. >> really the biggest failing was the failure to use any forensic testing to advance a defense on darlie's behalf. >> the fiber evidence was probably the strongest forensic evidence that the state had. >> the state contended that fibers found on a bread knife in the routier's kitchen matched