"In the 2005 energy bill, largely crafted by Vice-President Dick Cheney, fracking was explicitly exempted from federal review under the Safe Drinking Water Act. As a result of this dispensation, which has been dubbed the Halliburton Loophole, drilling companies are under no obligation to make public which chemicals they use."
— Climate Adaptation: “Burning Love” The New Yorker, on Marcellus Shale fracking.