Just think...if the "intruder" had left even one complete body cell behind, he could be cloned (theoretically anyway), and when the cloned individual reached adulthood, we'd know what the intruder looked like. My bet would be he'd be the spitting image of Sum Yung Gai or the lab janitor. The cloning method of identifying the killer sounds absurd and farfetched...but so is trying to identify the killer by running a bogus DNA sample through the database.
Sure seems odd to me that if JonBenet scratched the "intruder," all that got under her fingernails was degraded DNA and no skin or blood cells, and that the only DNA the "intruder" left in her panties was also degraded and its source unidentifiable. Was it from saliva? Mucous? Was it a combination of both from say, a sneeze?
That reminds me...anyone have a reliable non-Lin Wood source stating that the fingernail and panties DNA are from the same person?