. >> sandra levick is the public defender who represented both odom and tribble in their appeals. >> they would use terms like 'it's very rare, it's highly unlikely'. it conveyed to the jury a sense that this was statistically valid in some way. >> they said they matched my hair in all microscopical characteristics. and that's the way they presented it to the jury. and the jury took it for granted that that was my hair. >> at tribble's trial, the fbi agent told jurors that he identified a set of human hairs on a stocking cap near the crime scene. but when levick had those hairs dna tested, she got very different results. >> we had all 13 of the hairs that the fbi had examined. they were sent off to terry melton at mitotyping. nine of the hairs had come from the same source. a couple had come from different sources. and one was a dog. >> two different fbi agents who had looked at that and analyzed it, didn't recognize that it was dog hair? >> it was a canine. it was a domestic dog, yes. >> my personal conclusion was the dog committed the crime. (chuckle) >> but now how do you reconcil