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.
Not his car. His parents have two vehicles but the car that Natalee was in was the Honda owned by the brothers. We know that one wasn't too clean since police thought it had blood in it, when it didn't. They should have picked up hair from that vehicle.