The Court holds that the Federal Insecticide, Fungicide, and Rodenticide Act expressly preempts a state-law failure-to-warn claim that would require a pesticide manufacturer to add a cancer warning to a label EPA has approved without one. Because federal law requires Monsanto to use the EPA-approved Roundup label unless and until EPA approves or requires a change, a Missouri tort claim demanding a different label imposes a requirement "in addition to or different from" FIFRA's.
CASE: Monsanto v. Durnell
AUTHOR: Kavanaugh, J.
DECIDED: 2026-06-25
OPINION: https://www.supremecourt.gov/opinions/25pdf/24-1068_n7ip.pdf
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