Dear Editor: A letter published Feb. 17 (“Does anyone in Madison care about pesticide use”) was wrong to say that glyphosate (the herbicide in Roundup) is carcinogenic. I began my science career at the EPA, working in pesticides the year Roundup came to market. The EPA found no problem with it then, and again found no problem in its recent update on glyphosate. In fact, no regulatory agency in the world has found glyphosate to be a problem. After my stint at the EPA, I became a medical school professor and expert in the blood cancers that glyphosate is alleged to cause. I confidently state that there is no credible science supporting the notion that glyphosate causes any cancer. In fact, the Agricultural Health Study, funded by the National Cancer Institute, included 45,000 pesticide applicators who handled glyphosate since 1993 found that there was NO association between glyphosate use and ANY cancer.