Lise Olsen of the Houston Chronicle continues the Chronicle's investigation into the 1995 explosion at the BP oil refinery. Olson used OSHA data to uncover why few deaths had been attributed to refineries in the past. "Increasingly, the accuracy of government safety statistics is undermined by the changing work force. These days, up to half of refinery workers are contractors, who generally get some of the most dangerous jobs." Olson also reports on how BP is the fatality leader in their industry in the United States. "BP leads the U.S. refining industry in deaths over the last decade, with 22 fatalities since 1995 — more than a quarter of those killed in refineries nationwide ..." The paper included this explainer on how they did the story.