One year ago, an agency of the World Health Organization’s International Agency for Cancer Research (IARC) declared that glyphosate (or Roundup), the world’s most widely used herbicide, probably causes cancer. Then, in the fall, the European Food Safety Agency’s (EFSA) responded with an assessment that disagreed with the WHO’s findings. In response, 94 scientists came out in support of the IARC’s original findings. This week, the group—which includes scientists from around the world—released their article in the peer-reviewed Journal of Epidemiology and Community Health saying: The most appropriate and scientifically based evaluation of the cancers reported in humans and laboratory animals as well as supportive mechanistic data is that glyphosate is a probable human carcinogen. On the basis of this conclusion and in the absence of evidence to the contrary, it is reasonable to conclude that glyphosate formulations should also be considered likely human carcinogens. And their endorsement is no small matter. In fact, as the U.S. Environmental Protection Agency (EPA) reassesses the safety of glyphosate, and the U.S. Food and Drug Administration (FDA) plans to begin testing food for its residue, this volley has important implications.