Between 2007 and 2014 there were thirty-four accidents resulting in toxic releases at DuPont plants across the U.S., with a total of 8 fatalities. Four employees died of suffocation in a Houston, Texas, accident involving leakage of nearly of methyl mercaptan. As a result, the company became the largest of the 450 businesses placed into the Occupational Safety and Health Administration's "severe violator program" in July 2015. The program was established for companies OSHA says have repeatedly failed to address safety infractions.