In French, the word « expérience » has two different meanings, which often merge into each other: whether one hears it as « to experience » or as « to experiment », one will take it towards lay knowledge and techniques of struggle, or towards scientific protocols and techniques of governance. This article rides on this ambiguity, putting the two sides of this notion to the service, and to the test, of an analysis of practices and policies dealing with the (...) issue of drugs. On this specific question, the two meanings of political « expérience » are both maximally divergent and intimately tied to each other. (shrink)