But the reason there was no evidence was because the industry had won an unprecedented exemption from federal monitoring and regulation—the so-called Halliburton Loophole, ushered in under the administration of George W. Bush. The loophole exempted most fracking from regulations of the Safe Drinking Water Act, helping to ensure that companies did not have to report any of the chemicals they were injecting underground to the Environmental Protection Agency, while shielding their use of the riskiest chemicals from EPA oversight.
