For several years, environmental advocacy groups have been fighting to ban the pesticide chlorpyrifos from agricultural use. A turnover in leadership at the EPA has led to a moment of indecision on what to do about the chemical. Robert Sapolsky is a neuroscientist who's spent a long time assisting in the legal battle against chlorpyrifos. We discussed the devastating effects of chlorpyrifos on an exposed nervous system as well as his work to discredit the industry science claiming its safety.