Another federal judge presiding over hundreds of lawsuits like Johnson's is deciding whether the claim that Roundup weed killer can cause cancer is supported by good science.
Monsanto is now a unit of Bayer AG (BAYGn.DE), following a $62.5 billion takeover of the USA seed major which closed in June.
It wasn't the time, Chhabria said, for a judge to exclude those opinions - even if he believes potential jurors in the case might question the experts' findings or credibility.
Partridge added in his statement to NPR, "We have sympathy for anyone suffering from cancer, but the science clearly shows that glyphosate was not the cause".
The herbicide came under increasing scrutiny after the France-based International Agency for Research on Cancer, which is part of the World Health Organization, classified it as a "probable human carcinogen" in 2015.
There are hundreds of lawsuits in state and federal courts, and Chhabria is handling more than 400 of them.
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Monsanto denies the allegations and in a statement said it would continue to defend the lawsuits with evidence proving there is "absolutely no connection between glyphosate and cancer".
The company said its stance was backed up by more than 800 scientific studies and reviews.
The company had told Chhabria in March that none of the plaintiffs' specialists fulfilled scientific or legal requirements for admissibility and urged the judge to dismiss the cases. "It's time to hold Monsanto accountable for putting this risky product on the market", Wagstaff said.
The company Monsanto faces 5,000 lawsuits across America as it's alleged that one of their products, Roundup - which is still sold in the United Kingdom - can cause cancer.
Citing expert testimony from three doctors who spoke on plaintiffs' behalf, Chhabria wrote in his ruling, "the opinions of these experts, while shaky, are admissible".
Depending on how the Roundup trial plays out, it's expected that Johnson's suit, which he filed in 2016, could open the floodgates for many more similar suits against the biotech giant-up to at least 4,000 of them, according to the Chronicle.