What the frack?

Chemicals that pollute our environment should not be allowed to be considered ‘trade secrets’.  What is drilling mud?  What are fracking chemicals?   http://www.ncriverwatch.org/wordpress/2010/08/03/fracking-chemicals-%E2%80%94-just-how-harmful-can-1-percent-be/   It was part of the pbs program 'need to know'.  http://www.pbs.org/wnet/need-to-know/environment/the-price-of-gas-a-need-to-know-investigation/3170/