GrainneDhu
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I could guess at how the investigation could progress but typing the words isnt easy. Residue? Unless an animal is involved.
I hope this isn't too much information...
If human remains are eaten by an animal, then human DNA can be found in the animal's feces. It degrades quickly, though, so it has to be recovered quickly.
In the Robert Pickton case in Canada, some of the victims were linked to Pickton by extremely small amounts of blood found on the property. Those victims were declared presumed dead on a combination of lack of contact with loved ones (some of the women, although sex workers, stayed in regular contact with their families), known contact with Robert Pickton, the discovery of flecks of their blood on his property and Pickton's confession to an undercover policeman posing as his cellmate.
No single one of those factors would probably carry enough weight but put together, they made for legal certainty.