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It's possible to test remains years after the fact if they're properly preserved. Odds are by the time the police even found the scene, it was too late to save most evidence. If Maria's jaw was saved to make some kind of positive identification that would be one thing, but really it's unlikely any blood survived in a testable state.
Also, if the incident wasn't actually treated as a homicide they wouldn't have bothered to save any of the evidence anyway. There wasn't any doubt about everyone dying, and if things weren't seen as a crime, there wouldn't be much point in preserving it.
If some blood HAD been preserved, Ange could've had it compared to her own and known pretty clearly whether the blood came from a family member or not by 1998, but that would've been no help as there were a half-dozen or so people who were supposed to be on the island who weren't Ushiromiyas.
Plus, I seriously doubt they had any existing blood sample to compare Kanon and Shannon's DNA to, so even if you found some anomalous DNA, you can't really be sure it wasn't just Kanon's blood.
Essentially, it would have been no help even if Ange had access to it.
EDIT: Although it would've certainly been interesting to find out whether Battler's DNA was a close match to Ange's, eh?
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