Eric Bjerregaard, Chlorpyrifos is extensively used by GMO corporations in Hawaii and is banned for household use.
Prenatal exposure to chlorpyrifos is associated with neurodevelopmental problems.   "We report evidence of deficits in Working Memory Index and Full-Scale IQ as a function of prenatal CPF exposure at 7 years of age. These findings are important in light of continued widespread use of CPF in agricultural settings and possible longer-term educational implications of early cognitive deficits."  http://ccceh.org/scientific-papers/7-year-neurodevelopmental-scores-and-prenatal-exposure-to-chlorpyrifos-a-common-agricultural-pesticide
Another study of prenatal exposure to chlorpyrifos, showing developmental deficits:  http://ccceh.org/scientific-papers/impact-of-prenatal-chlorpyrifos-exposure-on-neurodevelopment-in-the-first-3-years-of-life-among-inner-city-children