They had already decided DW was guilty and bascially were just waiting for the body to showup at Glamis. How inconvient that it did not.
That's another question I have...if that body was placed at Dehesa after the road trip....the info about his road trip was known...why not place the body somewhere around Glamis to really tie it to him?
Was it a time constraint issue or just needed that body to be found at that time and maybe by a certain searcher??