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As journalists, we have dug into the controversy over the suspected carcinogenicity of the herbicide glyphosate (see B. Url Nature553, 381; 2018). We searched hundreds of internal documents from its manufacturer, Monsanto, released for pending lawsuits (see go.nature.com/2tfpbwy). We feel that our and others’ findings (N. Ghisi et al.Chemosphere145, 42–54; 2016) justify concern over the expertise used by the regulatory agencies to evaluate the safety of glyphosate.