I heard one of the forensic pathologists (Baden I think) speculating that there must be a pubic or other type hair, that might not be directly matchable to the full profiles of the players already done. I have since wondered if the latent searches of dorm rooms were really (or at least in part) to get (surreptitiously) hair samples from certain suspects for this purpose.
A couple of things: unless the hair taken in subsequent searches could be directly tied to defendants (i.e., from their hairbrush, undergarments, etc.), I wonder if it could be discounted in court. Also, why not ask the defendants for samples again, or get a court order for samples?
Also, wouldn't the hair color automatically eliminate one of the current defendants?