What kind of evidence does it require to get a widely used chemical banned? A professor of medicine and former state regulator explains how the case for chlorpyrifos as a threat to public health developed.
- Clinical Professor of Medicine, University of California, San Francisco
Starting Feb. 6, 2020, California farmers will be barred from using chlorpyrifos on their crops. The Trump administration says more study is needed, but other states are also moving ahead.
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