I would hope that car is still impounded, but with the way they do things there I wonder. I've learned from watching these investigations that the mud/dirt/bugs on the car can be traced to a location where it has been. I'm hoping the FBI is able to do some investigation.
Cyril Wecht said the popular notion is you can always find a hair or something but the truth is if you go at it with soap and water and a vacuum cleaner and a scrub brush you can pretty much destroy the evidence. Bet ol' snoot gave his car a good cleaning lately? Course, Scott just had that one hair on a pair of pliers.