The presidential commission studying the Deepwater Horizon oil spill released new details on Thursday. The findings indicate tests that Halliburton conducted before the BP spill show the cement that would be pumped down into the well would be unstable. Halliburton has said it tested the cement and it would be stable. For an update, Melissa Block talks to NPR's Richard Harris.
Panel: Tests Warned Of Cement Flaws Before Blowout
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