I wonder, though, why they haven't used all this to arrest Casey for murder? Is it because there is another person being implicated as an accessory? Is it because they are holding out hope to find the remains?
Because the D.A. may have to go to trial within 180 days of arrest on the murder charges.
And, like the Simpson case, the Defense here will cast doubt on every piece of evidence, every timeline etc.
So the D.A. is taking the time to make the case air-tight to hold off the onslaught of crap that Baez is going to try, in order to establish a doubt in one jurors mind.