The ability to (re)classify populations is a key component of state power, but not all new state classifications actually succeed in changing how people are categorized and governed. This article examines the French state’s partly unsuccessful project in 2005 to use a new classification—“psychic handicap”—to ensure that people with severe mental disorders received services and benefits from separate agencies based on a designation of being both “mentally ill” and “disabled.” Previous research has identified how new classifications can be impeded by (...) cultural and cognitive barriers to their adoption and struggles between professionals or administrators over their implementation. Drawing on 186 interviews, archival sources, and 13 months of observations across different French bureaucracies, I expand on this literature in two ways. First, I use the case of psychic handicap to argue that a new classification can also fail to achieve its intended effect when it constitutes a bureaucratically split personality—a combination of classifications that imply that individuals belong to two, mutually exclusive kinds of people. I show how psychic handicap embodied contradictory expectations about the behavior, characteristics, and institutional trajectory of people with mental disorders. Second, I identify how bureaucrats resolved these contradictions through mechanisms of refractory looping, outsourcing expertise, and classification by default, which in this case led to the reclassification of this population as simply “mentally ill.” This framework calls attention to how practical inconsistencies can limit the impact of new classifications, even absent overt resistance to their elaboration or implementation. (shrink)