This article demonstrates how the broader social development to understand behaviour and personhood as shaped by neurobiology forms a predominant narrative among police officers. Drawing on an ethnography of the Dutch police force and 73 interviews with officers, I examine first how they use neurobiological terms to describe and account for their embodied sensations as well as civilian behaviour. Second, I describe the functions these narratives have, that is, why officers use them. Finally, I show how neurobiological discourses are learned and (re)produced during training. Results indicate that officers invoke neurobiology both as facilitator of and explanation for action. The latter raises questions as to what extent neurobiological discourse obscures police responsibility and accountability. A more thorough understanding of how neurobiological discourses are used to understand and account for actions is relevant, given the growing pressures on public professionals to legitimise their work.