[js1138]

And they disregarded DNA...

They disregarded DNA because they didn't trust the police who gathered it. Not long after the OJ trial there was a major scandal in the LAPD involving manufactured evidence.

[RGSpincich]

That's right and these aliens will dispute unfriendly DNA findings for reasons most likely related to a perceived bias by the labs performing the tests. The statement was made that DNA would offer conclusive proof, I say that the aliens will argue with the inevitable non-proof or lack of proof. They don't need a PD scandal. If the DNA doesn't fit, they won't quit.