But if new evidence is found that points to intentional wrong doings then the old conclusions cannot be relied upon. Of a line of investigation was not prviously follwed to its end or if another investigation throws another light on previous investigations then surely the previous conclusions become highly suspect and can be revisited!?
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Yes, that sounds reasonable.
“But if new evidence is found...”
Yes. New evidence. In the real world, i.e., not the Swamp, new evidence can be grounds for a new trial or investigation. Of course, that was in the olden days when a person was “presumed innocent until proven guilty.” Now Mueller has thrown that out the window and America is now Bizarro World.