Scientific experts on both sides of the “Does glyphosate cause cancer?” question are testifying this week before a federal judge in San Francisco, who will decide after hearing the testimony whether hundreds of plaintiffs who allege glyphosate caused their non-Hodgkin lymphoma can proceed to trial.

The plaintiffs’ experts and those from defendant Monsanto will split “science week,” as U.S. District Judge Vincent Chhabria has dubbed it. A UCLA epidemiologist who testified Monday, Beate Ritz, said that after reviewing the scientific literature, she “concluded that, to a reasonable scientific degree of certainty, glyphosate and glyphosate-based compounds, including Roundup, do indeed cause (non-Hodgkin lymphoma).” Ritz then faced cross-examination by Monsanto attorney Eric Lasker, who tried to poke holes in her testimony.

Monsanto maintains that hundreds of studies have shown that glyphosate, the active ingredient in Roundup, the most widely used herbicide in the world, does not cause cancer.

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