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In page Exponent (consulting firm):

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The quality and neutrality of reports produced by the company have been called into question on various controversial topics. Common points of critique include corporate denialism and that, for industrial clients, only favorable reports are seemingly produced. Examples include Exponent arguing that dioxins do not cause cancer.[1] These questions of conflict of interest have been disputed. The type of work that Exponent performs is contractually highly confidential—until their clients decide otherwise. Thus, while Exponent may issue reports that are both favorable and unfavorable to its clients, Exponent's clients have the option of releasing only the favorable reports, creating the appearance of bias.