The use of a pesticide recently banned by a federal judge had been declining for 20 years. But one researcher says chlorpyrifos (klor-PEER-uh-foss) could still have long-term health effects in Iowa. Some scientists have linked the pesticide to nervous system damage. Ralph Altmeier is with the Iowa Center for Agricultural Safety and Health. He believes his father may have developed nerve damage from chlorpyrifos.

Chlorpyrifos is used on corn, soybeans and other crops, but a judge instructed the EPA to ban its use last month.