After years of exhaustive research linking the pesticide chlorpyrifos to a host of developmental and cognitive deficiencies in children, the EPA was poised to ban the chemical in November 2016. But something else happened that same month; the election of Donald Trump. As a result, this potent neurotoxin is still in use. Miriam Rotkin-Ellman is a senior scientist for the Natural Resources Defense Council, which is still fighting for a ban.