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I've been thinking. You know the cases for the random mass poisoning and The last case with carbon monoxide poisoning. The police investigated both those cases. I had a feeling that in both those cases the police know who the culprit is. But both those culprits were underage and just basically a kid. So I think the police just simply announced that the dad did a suicide, in order to cover up the fact that a kid did those stuff. And in carbon monoxide poisoning both the police and father know that the son did it, so the police willing let the father frame himself.