W
To say that since there is no scientific data, and I will take your word for that since I have no reason to believe otherwise, you are a fool, from a scientific perspective to say that there should be no limit.
Any scientist worth a **** will tell you the same thing. When you have no data you take the scientifically cautious approach which in this case would be some type of limit. Could it end up being more restrictive than needed? Certainly. Could it end up being less restrictive than needed. Certainly. But you at least have established some baseline that is safer than a free for all.
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