Well, when/if this goes to trial, all of the facts will come out. Just heard someone say that not only will they have to prove that Karr did it, they will also have to show that the Ramseys didn't. That note is going to go under a microscope.
Yes and this time they will be textually comparing it to all of Karr's writings, letters, emails etc. If they get a DNA match, nothing else will matter given this sick POS's history.