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The catch here is the word "known". It would be easy enough for companies to trot out an army of scientists to give them plausible deniability as to their knowledge of any health risks
True, but it would be similar to the tobacco cases from the 60's. Plus, they would be subjected to "reasonable person" standards in front of juries, so feigning ignorance would only get them so far, especially since civil courts have much lower burdens of proof than criminal.
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