On a cold night in January 2012, Dustin Bergsing climbed on top of a crude oil storage tank in North Dakota's Bakken oil field. His job was to open the hatch on top and drop a rope inside to measure the level of oil. But just after midnight, a co-worker found him dead, slumped next to the open hatch.
Even though an autopsy showed Bergsing had hydrocarbons in his blood — things like benzene and butane — the Occupational Safety and Health Administration's investigation found no safety violations. And it didn't fine the oil company.
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