In re Roundup Products Liability Litigation

390 F. Supp. 3d 1102 (2018)

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In re Roundup Products Liability Litigation

United States District Court for the Northern District of California
390 F. Supp. 3d 1102 (2018)

SS

Facts

Multiple individuals (patients) (plaintiffs) who had developed Non-Hodgkin lymphoma (NHL) sued Monsanto Company (defendant). Monsanto was the producer of glyphosate, an herbicide, which the patients claimed had caused their NHL. The International Agency for Research on Cancer (IARC) classified glyphosate as probably carcinogenic to humans but did not quantify the risk it posed. Some epidemiological studies found no link between glyphosate and NHL, but others found some link. In an early phase of the trial, the patients were required to prove that glyphosate could cause cancer in humans, that is, to establish general causation. The patients sought to introduce expert testimony from Dr. Christopher Portier, Dr. Beate Ritz, and Dr. Dennis Weisenburger. Each expert had surveyed the epidemiological studies of glyphosate and concluded that these studies showed that glyphosate exposure increased the risk of developing NHL by a statistically significant amount. The experts also critiqued the study upon which Monsanto relied. Monsanto moved for summary judgment, arguing that the evidence offered by the three experts was too weak to support the patients’ case for general causation.

Rule of Law

Issue

Holding and Reasoning (Chhabria, J.)

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