Article includes comments from Michael Dourson, PhD, professor in the UC Department of Environmental Health.

Environmental Protection Agency Administrator Scott Pruitt denied a petition Wednesday requesting that the agency ban the use of the chlorpyrifos on all United States food crops. Chlorpyrifos, a product of Dow Agrosciences, is an insecticide proved effective against mosquitoes, cockroaches and fire ants, which has been registered for use in the US since 1965.

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