Employees at a courthouse in Macon, Missouri went to work one day. Within two days virtually all had been to the doctor, most to the emergency room. Doctors believe it was because they had been exposed to a chemical called Dursban. Dursban is the brand name of the chemical chlorpyrophis made by Dow Chemical. Doctors believe it was the exposure to Dursban following a routine indoor bug spraying that made the employees sick. The investigation found that DOW and the EPA knew of problems with Dursban.