"We look forward to taking the next step – bringing our clients to justice," he said in a statement.
The judge wanted to find out if the science is behind the claim that glyphosate can cause non-Hodgkin's lymphoma and has been thoroughly tested and met other requirements to be considered valid.
Chhabria spent a week in March listening to duel statements by epidemiologists. He questioned her about possible strengths and weaknesses of research on the cancer risk of glyphosate.
Beate Ritz, an epidemiologist at the University of California, Los Angeles, testified for the plaintiffs that their review of the scientific literature led them to conclude glyphosate and glyphosate-based compounds such as Roundup can cause non-Hodgkin's lymphoma.
Ritz said a study by the National Institutes of Health from 201
an in-house expert, Lorelei Mucci, a cancer epidemiologist at Harvard TH Chan's School of Public Health praised the 2017 study.
"If you look at the body of epidemiological literature on this subject, there is no evidence of a positive link between glyphosate and NHL risk," she said of Non-Hodgkin -Lymphom
In his ruling on Tuesday, the judge said that Ritz and Mucci could both testify before a jury.
Monsanto developed glyphosate in the 1970s, and the weed killer is now sold in more than 160 countries. Farmers in California, the most productive state in the US, use it for more than 200 crops. Homeowners use it on their lawns and gardens.
The herbicide was increasingly investigated 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.
A flood of lawsuits against Monsanto followed, and California added glyphosate to it Add a list of chemicals known to cause cancer. Monsanto has attacked the opinion of the international research agency as an outlier.
The Environmental Protection Agency says glyphosate is safe for humans when used according to the label's instructions.
A federal judge in Sacramento has prevented California from demanding Roundup's label stating that it is known to cause cancer, saying the warning is misleading because almost all regulators have come to the conclusion that there is no evidence indicates that glyphosate is carcinogenic.