As others have said, the subjectivity will always be a part of it. We all want 100% certainty, but try getting any expert to say that. I've been told that the only thing that a doctor will say on the stand with that degree of certainty is whether someone is alive or dead.
As a testifying expert witness, the standard that is applied is "within a reasonable degree of certainty" ... which is just fancy talk for "more likely than not." Basically, the expert is at least 51% sure. That is the standard here in civil courts. I suspect that level of certainty would not be thrilling for the objectivity sought by this type of investigation. That said, I like the idea.
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