They ruled in one case that roundup caused a particular person's cancer. Even though medically 80% of cases of that type of cancer do not have an environmental cause (ie random mutation is responsible for 80% of cases).
So every fifth case has an environmental cause and Monsanto got caught pants down actively interfering with the legally required process^1 that was used to certify their weed killers as not being a environmental hazard, including being a cause for cancer.
^1 The results of independent studies are supposed to act as basis for government approval.
