A federal jury Tuesday found that Monsanto's popular weed killer Roundup was a "substantial factor" in causing a California man's cancer, dealing a significant blow to the company as it aggressively defends its products against thousands of similar claims.
Another California man was awarded $US289 million ($A407 million) in August after a state court jury found Roundup caused his cancer, sending Bayer shares plunging at the time.
The report also found it particularly concerning that glyphosate was discovered in 3 out of 4 organic alcoholic beverages tested, despite the fact that weed killer products like Roundup have always been prohibited in the making of organic beer and wine.
"Mr. Hardeman is pleased that the jury unanimously held that Roundup caused his non-Hodgkin's lymphoma". "We feel confident. a jury. will see that Monsanto has committed 40 years of corporate malfeasance", a Hardeman attorney says.
Since Bayer's subsidiary, Monsanto, lost in last Aug's trial, investors have been viewing Bayer shares as high-risk stocks which they don't want to include in their portfolios. However a judge later slashed the damages payout to $78 million.
The trial could pave the way for more cases linking glyphosate in Roundup to the development of cancer. Mr Hardeman was the first person to challenge Monsanto's Roundup in a federal court.
However, the case now moves to a second stage, which will determine liability and damages.
Some legal experts had said Chhabria's decision was beneficial to Bayer, which says decades of studies and regulatory evaluations have shown the weed killer to be safe for human use.
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A US jury on Wednesday found that a herbicide weed killer produced by a unit of German agriculture and pharmaceuticals company Bayer, contributed to a man's cancer.
Bayer acquired Roundup through its acquisition of Monsanto.
Hardeman had chemotherapy for non-Hodgkin lymphoma in 2015.
Unlike the US Environmental Protection Agency, the International Agency for Research on Cancer - which is part of the World Health Organization - has listed glyphosate as "probably carcinogenic".
Notably, the largest and most recent epidemiologic study - the 2018 independent National Cancer Institute-supported long-term study that followed over 50,000 pesticide applicators for more than 20 years and was published after the IARC monograph - found no association between glyphosate-based herbicides and cancer.
With that question decided against Bayer, jurors will now hear about two more weeks of testimony to determine whether the company is liable for Hardeman's cancer, and if so, what damages he's owed.