Rules over what doctors can or cannot reveal to patients differ from state to state. The rules in Pennsylvania have yet to be clarified sufficiently to satisfy physicians, some of whom have filed lawsuits against the state.
Concerns about fracking have led to more than a dozen state laws requiring drilling companies to make certain disclosures about the chemicals they use to state agencies or online. Like the Pennsylvania law, several include requirements that doctors receiving the information sign confidentiality agreements.
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