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The FDA has quietly proposed expanding its “threshold of regulation” (TOR) exemption, which currently lets chemicals below 0.5 parts per billion be used in food packaging and processing equipment without safety review if they aren’t carcinogenic.

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Advocates argue that many non-carcinogenic chemicals can harm health at doses well below 0.5 ppb, and that the rule ignores cumulative exposure, creates a secondary loophole for carcinogenic impurities, and gives consumers no way to know which products contain exempted chemicals.