Searching is the potential key to solving this case not to mention the measure of comfort it would bring to the family in having a place to go and mourn with dignity. I'm not so naive not to know the "needle in the haystack" implications of such an undertaking but if this was about a person I love or even a person I care about, I would never want to stop looking no matter what. Especially if DS is involved here the search area need not be that wide, possibly within a 2 miles radius from where the Hummer was discovered. A van, a truck or any similar vehicle was probably used to transport Michelle since the Hummer seems to have been found "clean", which to me indicates the perp took her from it and into another vehicle ... one that could accommodate a body or a person still alive without the risk of attracting attention and where such a transport could be achieved under the radar of a search for MP's Hummer, not to mention all the advantages from the perp's point of view in not missing potentially incriminating forensic evidence where the police would certainly have found them. JMO