148The responsibility for determining the level of risk which is deemed unacceptable lies, provided that the applicable rules are observed, with the Community institutions responsible for the political choice of determining an appropriate level of protection for society. It is for those institutions to determine the critical probability threshold for adverse effects on human health and for the seriousness of those possible effects which, in their judgment, is no longer acceptable for society and above which it is necessary, in the interests of protecting human health, to take preventive measures in spite of any existing scientific uncertainty (see, to that effect, Case C-473/98 Toolex [2000] ECR I-5681, paragraph 45, and Pfizer Animal Health v Council, cited in paragraph 145 above, paragraphs 150 and 151).
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