ProPublica examined government environmental reports and private lawsuits, and interviewed scores of residents, physicians and toxicologists in four states -- Colorado, Texas, Wyoming and Pennsylvania -- that are drilling hot spots. Our review showed that cases like Wallace-Babb's go back a decade in parts of Colorado and Wyoming, where drilling has taken place for years. They are just beginning to emerge in Pennsylvania, where the Marcellus Shale drilling boom began in earnest in 2008.
Concern about such health complaints is longstanding -- Congress held hearings on them in 2007 at which Wallace-Babb testified. But the extent and cause of the problems remains unknown. Neither states nor the federal government have systematically tracked reports from people like Wallace-Babb, or comprehensively investigated how drilling affects human health.
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