They have been searching the landfills and for quite awhile. It has been mentioned a couple of times.
I have a crazy suggestion that in larger cities, where the trucks drive in with their loads to dump, that they have a sensing device that can detect human decomp. It probably would cost quite a bit of money, but I am sure that they spend quite a few dollars in the larger cities on things they just don't need, and this could save them quite a few dollars on searches alone.
Oh thanks. I had not heard that. I think that's where something will be found.