. >> michael brune: i would say that they've been cavalier. i would say that they've been irresponsible. >> stahl: what should they have done? what should they do right now? >> brune: the first thing that the industry should do is disclose what chemicals are being used in fracking, and then limit the amount of toxic chemicals to a point of zero. >> stahl: the industry doesn't have to disclose what's in the tens of thousands of gallons of chemicals they use when they fracture the shale because of the so-called "halliburton loophole." halliburton is a leading fracking company, and the loophole was created in 2005 under vice-president dick cheney, who used to be halliburton's c.e.o. >> brune: the 2005 energy bill completely exempted the natural gas industry and fracking technology from any regulation under the safe drinking water act. it's an outrage. >> stahl: did the vice-president put that in there? >> brune: the vice-president advocated for it, and he pushed congress to insert it into the language. >> stahl: part of the fracturing process invo