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The management of “alarming information” about public health issues has recently experienced a strong dynamic of institutionalization, marked by the creation of dedicated independent agencies, in France. A little studied consequence of this process: it reinforces the role of certain administrative actors acting as intermediaries, who strongly influence the way warning signals circulate in the administration. Analyzing the reception of a scientific warning signal for the inefficiency of premarketing policies vis-à-vis hazardous pesticides, this article shows how intermediary administrative actors both helped alarming data to circulate, but also tamed these data, translating them in narrow terms aligned with existing public policies.