"Accident at DuPont Puts Plant in Spotlight"
"DuPont Co. ’s chemical plant in La Porte, Texas, for many years has gained a strong reputation among industrial-safety experts for migrating to safer chemicals. ... So when a gas leak at the plant earlier this month caused four employees—two of them brothers—to be fatally overcome by an industrial chemical called methyl mercaptan, some in the chemical safety world were taken aback."