ALF Brief Urges Full 11th Circuit To Enforce Federal Preemption of Pesticide Failure-To-Warn Claims

The U.S. Court of Appeals for the Eleventh Circuit has granted rehearing en banc in Carson v. Monsanto Co., No. 21-10994, one of thousands of state-law personal injury suits alleging that Monsanto, the manufacturer of Roundup herbicide, failed to provide a label warning that glyphosate, the active ingredient in Roundup, can cause cancer. The U.S. Environmental Protection Agency (EPA), which administers the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), has repeatedly determined, based on review of extensive scientific data, that glyphosate does not cause cancer in humans, and thus, that including a cancer warning on Roundup labeling would be false and misleading and a violation of FIFRA’s misbranding provisions.

The Atlantic Legal Foundation, joined by the Washington Legal Foundation, has filed an en banc amicus brief urging the court of appeals to hold that FIFRA expressly preempts Plaintiff-Appellant Carson’s failure-to-warn claim. The brief argues that in so holding, the court should narrowly construe the so-called “parallel requirements” exception to FIFRA preemption. A Law360 article quotes extensively from the brief.

Issue Areas:

Sound Science

Read the Amicus Brief:
Question(s) Presented:

Whether FIFRA expressly and/or impliedly preempts a state-law damages claim premised on a manufacturer’s failure to provide a cancer-related label warning that EPA has determined not only is scientifically unwarranted, but also false and misleading.

Additional Background:

FIFRA provides that  “[a] State shall not impose or continue in effect any requirements for labeling or packaging in addition to or different from those required under [FIFRA].”  7 U.S.C. § 136v(b). In Bates v. Dow AgroSciences LLC, 544 U.S. 431 (2005), the Supreme Court held that this express preemption provision applies to state-law failure-to-warn claims against pesticide manufacturers.  The Court indicated, however, that to be preempted, a failure-to-warn claim must be based on a state-tort duty that is “in addition to or different from”—not “parallel” or  “equivalent” to, or “genuinely consistent” with—FIFRA’s labeling requirements, as implemented by EPA.

ALF’s Amicus Brief:

ALF’s amicus brief argues that the so-called  “parallel requirements” exception to FIFRA preemption is narrow, and does not apply to Carson’s failure-to-warn claim.  “A state-law requirement for inclusion of a cancer warning on a federally regulated pesticide product’s label cannot be parallel or equivalent to, or in any way consistent with, an EPA requirement prohibiting such a warning on the product’s label.”

In view of the expansive manner in which the plaintiffs’ bar, and some courts, have interpreted the parallel requirements exception, ALF’s brief urges the court of appeals to clarify the exception’s narrow scope and identify the limited circumstances—not present in the case of Roundup—under which it applies (e.g., if a manufacturer fails to include on  a label a specific warning that EPA, in accordance with FIFRA, has determined is necessary to protect health or the environment).


On July 10, 2023 the en banc Eleventh Circuit issued an opinion remanding the case to district court.


Email ALF Executive Vice President & General Counsel Lawrence Ebner

Date Originally Posted: March 16, 2023

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