I just caught a summary of this case on Disappeared on ID. One of the detectives, in commenting on the amount of blood, said it would be the amount you would expect from a mosquito. Anyone who has ever smacked a mosquito full of blood knows it's a significant amount, so I wonder just how much DNA they really have. Regardless, if what they have was sufficient to test back in 2001, albeit by consuming the entire sample, then surely there must be enough to do LCN testing now and still retain some of the sample?
I would also agree that given the brief time the tonneau cover was on the truck, and that DNA confirmed hair from Patti's cat was on it is damning evidence. If Patti wasn't in the bed of his truck then there is no way that hair got there. DNA confirmation that the blood is Patti's would be the nail in his coffin. How long will Patti's family wait before deciding to proceed with the case? It's time!