The Polish Geological Institute has published a study that the toxic refuse at a drilling site was reused and not harmful to the environment. See "Polish report: shale gas extraction not harmful", Monika Scislowska, Associated Press, 2012-03-02.
But then comes the fine print. The site is a test drilling. There is no harm if "done in accordance with legal regulations" (and how many U.S. companies complain about or ignore legal regulations). The study was done at the beginning of exploration and "does not reflect dangers from a long-term activity."
