valley nearly 20 years ago. eskenazi foundregnant women with signs of organophosphates in their une gave birth earlier, had children with diminished i.q.'s, and more: >> attention problems when the kid was school age, lower i.q., in middle school age, poor executive function, a little bit later, and now we're beginning to show some signs of poor social cognition which is kind of related to autism like symptoms. >> reporter: claudia angulo lives beside the fields in the central valley with her four children. her 12-year old son has a.d.h.d. she is convinced it is caused by exposure to chlorpyrifos while he was in utero. >> ( translated ): well, as a mother, knowing abouththe pesticid caused this in my child worries me. i'm also worried that my children continue to be exposedi toon a daily basis. >> reporter: in august, a federal court ruled the e.p.a. must ban all uses of chlorpyrifos nationwide by theno end ofmber. e agency originally had bomised two years ago it would put the ban in plamarch of 2017, but president trump's oe.p.a. shelved that idea allow further study, keeping chlorpyrifos on the market.e thp.a. ha