Case Preview: Monsanto Co. v. Durnell | The Roundup Reckoning: The $7 Billion Battle Over Pesticide Labels

Have you ever read the warning label on a bottle of weed killer?

I can't think of any better way to spend a Saturday reading warning labels.

Yeah, most people don't. They trust the label.

They figure if it's on the shelf at the garden store, someone checked it.

But what happens when a farmer or a homeowner gets cancer?

And it turns out the label never warned them.

Who decides whether that warning should have been there?

A federal agency or a jury?

That's the question Monsanto desperately wants answered in its favor.

And it's exactly what we're digging into today in Monsanto versus Dernel.

You really should do it. You might regret it if you don't.

Too dark. Questions about this case? Reach out to us via LinkedIn at the High Court report.

All right, here's what you need to know. The court agreed to decide.

Whether the federal insecticide, fungicide, and rodenticide act,

fifra, pre-empts, meaning wipes out, a label-based failure to warn lawsuit

when EPA approved the label and didn't require the warning.

Okay, let me translate. Fifra, the federal pesticide law, runs a whole

registration system. Before any pesticide hits the shelf,

Monsanto has to submit data to EPA. EPA reviews it, decides the product doesn't pose

unreasonable risk, and approves the label. The label goes on the bottle and a story, right?

That's what Monsanto says. End of story.

Dernel says not so fast, because fifra also has this separate provision that says

a pesticide becomes illegal to sell the moment it becomes misbranded,

meaning the label misleads consumers or omits a warning it should carry.

And here's the kicker. Fifra explicitly says that EPA's decision

to register a pesticide is not, and I'm quoting the statute,

a defense for the commission of any offense under federal law.

Right, so Monsanto says the label EPA approved is the law.

Dernel says actually courts and juries decide whether that label broke the law.

That's the fight. Let's back up and tell John Dernel's story.

He started spraying Roundup in 1996.

Monsanto's flagship glyphosate-based weed killer.

He sprayed it for more than 20 years.

No protective equipment, no cancer warning on the bottle.

He trusted the label. Monsanto's marketing told him Roundup was safe.

Then in 2018, he got a diagnosis of mantle cell lymphoma,

a rare and aggressive blood cancer.

He sued Monsanto in Missouri State Court,

and the jury, after hearing the evidence,

awarded him $1.25 million on his failure to warn claim.

But here's the thing, the jury rejected every other claim he brought.

Designed effect? Gone.

Other statutory claims? Gone.

Just the failure to warn.

And to reach that verdict, the jury necessarily found two things.

Roundup increased Dernel's cancer risk, and Monsanto never told him.

Monsanto appealed, arguing the claim never should have gotten to a jury.

Federal law blocked it entirely.

The Missouri Court of Appeals disagreed and affirmed the verdict.

The Missouri Supreme Court declined to take the case,

and now it's at the Supreme Court.

The Court granted cert because this touches one of the biggest

unresolved questions in modern preemption law.

Does a federal agency stamp of approval

insulate manufacturers from state tort liability?

There's no clean-circuit consensus,

and with over 100,000 Roundup lawsuits pending nationally,

the stakes demanded a definitive answer.

All right, let's get into the arguments.

Monsanto goes first.

Monsanto's first argument,

when EPA registers a pesticide,

it makes a product-specific judgment

that the label contains all warnings necessary to protect human health.

That judgment constitutes a binding federal requirement.

And Fiffer's preemption clause says,

states can't impose labeling requirements

in addition to or different from those required under the federal law.

So Monsanto's theory is,

EPA reviewed decades of cancer data on glyphosate

and said no cancer warning needed.

That determination locked in the label.

A Missouri jury can't then say,

actually, Monsanto,

you needed a cancer warning.

And Monsanto leans hard on regal versus metronic.

That's a 2008 Supreme Court case,

where the court held that FDA's pre-market approval

of a medical device imposed specific federal requirements

that preempted state tort claims.

Monsanto says same thing here.

EPA's registration is just like FDA's pre-market approval.

The analogy Monsanto uses,

EPA is to round up label what FDA is to a pacemaker design.

When the federal government reviewed it,

approved it, and said this is what you use,

states can't demand something different.

Monsanto's second argument,

even if you think state failure to warn law

can sometimes survive preemption,

this verdict can't,

because Missouri standard differs from FIFRA's standard.

Here's the difference they point to.

FIFRA requires EPA to weigh the economic,

social, and environmental costs and benefits of pesticide use

when deciding whether a warning is necessary

to protect health in the environment.

Missouri juries get no such instruction.

Missouri presents unreasonable danger

to a jury without definition.

No cost-benefit analysis required.

And Monsanto says that gap matters.

A Missouri jury sees an injured plaintiff with cancer

and never confronts the farmer who depends on roundup to feed the country.

EPA balance those competing interests.

The jury didn't.

Monsanto's third argument, impossibility.

Even if you think Missouri law can survive express preemption in some cases,

it can't hear, because Monsanto physically could not do

what Missouri law demanded.

How?

Federal law made it unlawful to distribute roundup

with a label substantially different

from the EPA-approved version.

Adding a cancer warning would be substantially different.

And in 2019, EPA sent a letter to all glyphosate manufacturers.

Explicitly warning them that a cancer label would render their products

misbranded, illegal under federal law.

So Monsanto says, state law told us to add a cancer warning.

Federal law said, add that warning and you break federal law.

You can't comply with both.

Preempted.

And Monsanto draws a direct line to PLEVA vs.

Mensing.

2011 Supreme Court case on generic drug labels,

where the court said,

if you can't independently do under federal law

what state law requires, it's preempted.

Now, Dernel fires back.

And his first response is the biggest one.

He says,

everything Monsanto just argued assumes that EPA's registration decision

settles whether roundups label violated the misbranding prohibition.

But Fifre never gave EPA that power.

Dernel leans on Loperbright Enterprises versus Riemondo,

a 2024 Supreme Court case that eliminated judicial

deference to agencies interpreting their own statutes.

After Loperbright, an agency's reading of a statute

binds courts only when Congress explicitly

delegated that interpretive authority.

And Dernel says,

find me one sentence in Fifre that delegates to EPA,

the power to conclusively determine whether a pesticide label

violates the misbranding prohibition.

There isn't one.

He points straight to Fifre's text,

section 136AF2,

in no event shall registration be construed as a defense

for the commission of any offense under the subchapter.

The statute literally says EPA's approval

can't shield manufacturers from a misbranding charge.

EPA's determination amounts to prima facie evidence,

a rebuttable presumption, not a final verdict.

And he stacks the evidence.

Fifre provides for jury trials and condemnation proceedings

over misbranded pesticides.

Fifre provides jury trials in civil penalty cases.

Fifre authorizes criminal prosecution

with jury trial rights.

None of that makes sense if EPA already

decided the question conclusively.

Dernel's second argument,

Missouri law and Fifre say the same thing,

both forbid selling a pesticide with a misleading

or inadequate label.

When state and federal law prohibit identical conduct,

there's no conflict.

They run parallel, not in opposition.

He points to baits versus Dow agro sciences,

the 2005 Supreme Court case that first drew the lines here,

which held that state failure to warn law,

targeting false or misleading pesticide labels,

is not preempted because it mirrors

Fifre's misbranding provisions.

The jury found Roundup's label,

misleading and inadequate.

That finding enforces Fifre's own standards.

And Dernel adds a procedural gut punch.

Bates put the burden on Monsanto.

If you think Missouri law reaches beyond Fifre,

you request a jury instruction telling the jury

to apply Missouri law consistent with federal standards.

Monsanto never asked for that instruction,

never challenge the jury instructions at trial,

never raise the issue on appeal,

forfeited.

Dernel's third argument on impossibility.

Monsanto could have added a cancer warning

without asking EPA's permission.

And actually, Monsanto's own parent company proved it.

Plot twist.

In 2012, Bayer Crop Science,

Monsanto's parent,

added a California Proposition 65 cancer warning

to a different pesticide label,

Larvin Technical,

through a simple notification procedure to EPA.

EPA confirmed the change fell

within permitted notification rules.

Dernel argues EPA's own regulations from 1995 and 1998

allowed manufacturers to add advisory statements

related to precautions by notification.

No approval required.

Monsanto sat on its hands.

It never asked EPA to approve a cancer warning.

Under the all-brecht standard from 2019,

you can't claim impossibility if you never tried.

And Dernel's fallback,

even if Monsanto genuinely could not change the label,

Fifre still required it to stop selling a pesticide

the jury found misbranded.

Both state and federal law demand the same response.

Stop selling.

When both sovereigns command cessation,

cessation is both possible and required.

So what does this actually mean for real people?

If Monsanto wins and the court rules Fifre pre-empts

failure to warn claims when EPA approved the label

over 100,000 roundup lawsuits effectively collapse,

that $7.25 billion class settlement buyer announced,

the remaining nearly $1 billion in pending appeals,

the opt out cases gone,

or dramatically reduced in value,

and the implications reach beyond roundup.

Every manufacturer of an EPA registered pesticide gains a shield.

Get the EPA label approved,

and state-tort law can't touch you,

no matter what juries might think about whether

your label warned consumers adequately.

On the flip side, if Dernel wins,

pesticide manufacturers face liability in every state court,

with every jury applying its own version of what

adequate warning means.

Monsanto warns that means a patchwork of conflicting verdicts,

overwarning that waters down the label's consumers

actually need to read,

and reduced incentives to develop next-generation pesticides.

The agricultural stakes are real.

President Trump signed an executive order in February,

2026, declaring that loss of access to glyphosate-based

herbicides would cause a debilitating impact

on domestic agricultural capabilities.

Farmers planted glyphosate-resistant crops

over a massive share of American crop land.

No direct replacement exists at scale.

But Dernel says,

that's a policy argument for Congress, not this court.

Any points out that Monsanto actually lobbied Congress

in 2023 and 2024,

to add explicit immunity language to FIFRA.

Blocking state-law liability for labels EPA approved.

Congress never passed it.

The fact that Monsanto asked Congress for something,

the company now claims FIFRA already provides,

tells you everything.

So those are the stakes.

What should we watch for at oral arguments?

I'd watch for this Loper-bright question front and center.

Does FIFRA actually delegate to EPA,

the authority to make binding conclusive pronouncements

on whether a pesticide label violates the misbranding prohibition?

If the answer is no,

Monsanto's entire express preemption theory collapses.

Expect the justices to press Monsanto hard

on where in the text that delegation appears.

And watch for questions about the buyer-larven label change.

If buyer actually added a cancer warning

to a pesticide label in 2012 through notification and EPA signed off,

how does Monsanto claim it faced legal impossibility

in adding a cancer warning to round up?

The fault line on the court might run between

Justice's skeptical of agency power after Loper-bright.

Who may side with Dernel on the delegation question?

And Justice's worried about the broader consequences

of exposing federal agency decisions to jury,

second-guessing in 50 states.

And watch for questions about what happens to bates.

Monsanto's reading of Fifra would arguably require

a finding of preemption in bates itself,

because Dow's strong arm label also got EPA registration.

The court obviously didn't preempt in bates.

Someone will ask Monsanto to square that circle.

Bottom line, time.

Why does this case matter?

Because it draws the line between two visions

of how federal regulation works.

In Monsanto's vision, EPA approval means the science question is closed.

Juries don't reexamine what the government already decided.

In Dernel's vision, federal registration gives you the right to sell your product,

but it doesn't immunize you from a jury's finding that your label lied.

100,000 cancer patients are watching.

American farmers are watching,

and every product liability lawyer in the country is watching.

If you made it this far,

share this episode with one person who uses round up on their lawn

and has no idea this case exists, because it might.

You can find us on Apple Podcasts, Spotify, YouTube,

just search the High Court report.

And honestly, subscribing takes less time than reading a pesticide label.

Please do it.

Questions about this case?

Hit us up on LinkedIn at the High Court report.

Talk to you soon.