(NEW YORK) — A federal appeals court is deciding whether to revive more than 500 lawsuits filed by parents who claimed their children’s autism or attention deficit hyperactivity disorder (ADHD) was caused by prenatal exposure to Tylenol.

The lawsuits were dismissed in December 2023 by U.S. District Judge Denise Cote after finding that the plaintiffs’ scientific experts did not provide credible evidence linking use of Tylenol, or its active ingredient acetaminophen, to autism or ADHD.

Cote wrote in her ruling that “the unstructured approach adopted by the plaintiffs’ experts permitted cherry-picking, allowed a results-driven analysis, and obscured the complexities, inconsistencies, and weaknesses in the underlying data.”

However, in a hearing this week, two judges of a three-judge panel

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