What is going on here?

Lisa P. Jackson now supports the Obama Administration's decision to produce natural gas. 

http://www.newsok.com/epa-chief-lisa-jackson-says-natural-gas-production-is-a-good-thing/article/3571012?custom_click=lead_story_title

This article states that "she didn't know of any “proven case” in which hydraulic fracturing had affected drinking water." 


However in 2009 an EPA study stated that there had been cases of water contamination by chemicals found in hydraulic fracturing fluids. 

http://liwatersentinels.org/index.php?option=com_myblog&show=EPA-Confirms-Drinking-Water-Contamination-by-Hydraulic-Fracturing-.html&blogger=Jessica&Itemid=256