Have detectives done or considered doing a blood saturation test? It helped in the Scott Dunn case out of Texas. May be something to consider pushing for!
I'm so sorry for your loss. I watched this episode twice still can't believe Rob hasn't slipped up by now! He will tell the wrong person eventually. During his first interview he said "Ray was a great guy, do anything for anybody and then this happened!" What is "this", if Ray is only missing...