Miners carried canaries into coal mines; if the canary died it was an early warning of the presence of toxic gases that could also asphyxiate humans or explode. The Trump administration has decided to use children and farmworkers as 21st century canaries, continuing their exposure to a pesticide named chlorpyrifos that has been linked to serious health concerns.

The toxicity of this commonly used pesticide was demonstrated in early May when chlorpyrifos sprayed on a Bakersfield orchard drifted into a neighboring cabbage field, sickening a dozen farmworkers. One was hospitalized.

This is the same chemical that Scott Pruitt, the new administrator of the Environmental Protection Agency, refused to ban in March, despite the advice of EPA scientists.

In November 2016, EPA scientists reported that residues of chlorpyrifos on food crops exceed the federal safety standards for pesticides. Their analysis also found that in areas of extensive but permitted chlorpyrifos use, exposure to the chemical from drinking water exceeds levels safe for human consumption. Workers “who mix, load and apply chlorpyrifos pesticide products,” according to the analysis, face particular risks.