The Pennsylvania Consolidated Statutes, requires companies to provide the names of chemicals and gases used in fracking, to a state-maintained registry. An added legislative conference provision of HB1950 CL58 included a gag order for health professionals, “The vendor, service provider or operator may request, and the health professional shall provide upon request, a written statement of need and a confidentiality agreement from the health professional as soon as circumstances permit, in conformance with regulations promulgated under this chapter.”
In a nut shell, physicians can receive information for patients suspected of illness from fracking chemicals, but are gagged from letting those patients know the cause of their illness.
To read more about this, take a look at these articles.
Walter Brasch: Pennsylvania Fracking Law Gags Physicians