Health · Medical Research · 9 hrs ago
Bayer Wins US Roundup Cancer Case After Supreme Court Ruling
A jury in St. Louis rejected John Durnell’s claims against Bayer over Roundup, a weedkiller made by Monsanto, which Bayer bought in 2018.
Durnell said using the glyphosate-based product caused his blood cancer.
His lawyers argued that Roundup was defectively designed and that Monsanto had deliberately misled users.
The verdict followed a US Supreme Court ruling in Bayer’s favor in June, which said the company did not have to add cancer warnings to Roundup packaging because the federal regulator had deemed glyphosate safe.
That decision makes lawsuits based on missing cancer warnings largely unavailable in the United States.
The St. Louis case used different arguments, and Bayer said the verdict was a strong signal that plaintiffs face significant hurdles.
A jury in St. Louis ruled for Bayer in a case brought by John Durnell over his use of Roundup.
Durnell said he developed blood cancer after using the weedkiller, while his lawyers argued that Roundup was defectively designed and that he had been deliberately misled.
The verdict was the first US court ruling since the Supreme Court ruled for Bayer in late June.
The Supreme Court said Bayer was not required to add cancer warnings to glyphosate product packaging because the relevant US agency had deemed the active ingredient safe.
Bayer said the verdict was a strong signal that similar claims faced significant hurdles.
- Who
- Bayer and its Monsanto subsidiary, and plaintiff John Durnell.
- What
- A jury ruled for Bayer in a case alleging Roundup caused Durnell’s blood cancer. His lawyers argued that the product was defectively designed and that he was deliberately misled.
- When
- The article was published on October 30, 2026. The Supreme Court ruling it refers to came in late June.
- Where
- St. Louis, Missouri, and the US Supreme Court in Washington.
- Why
- Durnell attributed his blood cancer to using Roundup. His lawyers argued the product was defective and that he had been deliberately misled.
John Durnell and his lawyers
Bayer
Product safety
John Durnell and his lawyers
They argued Roundup was defectively designed and that Durnell had been deliberately misled.
Bayer
Bayer welcomed the verdict and said there were significant hurdles for plaintiffs’ arguments.
Cancer warnings
John Durnell and his lawyers
Durnell attributed his blood cancer to using Roundup.
Bayer
The Supreme Court said Bayer was not required to add additional cancer warnings because the relevant US agency had deemed glyphosate safe.
The US Supreme Court ruled for Bayer, saying the company did not have to add additional cancer warnings to glyphosate product packaging.
A jury in St. Louis ruled for Bayer in the case brought by John Durnell.
- Plaintiff
- John Durnell
- Product
- Roundup, a glyphosate-based weedkiller
- Claim
- Durnell attributed his blood cancer to using Roundup
- Court location
- St. Louis
- Supreme Court ruling
- Late June 2026
What people are saying
We welcome the decision
a strong signal
significant hurdles