This paper is based on qualitative empirical research conducted in three Canadian penitentiaries. It analyzes four significant dimensions of the relational economy in detention: the promotion of prisoners’ rights; the interrelation between active security, leadership, and communicational order; the uses of “risk” in detention; and the prison’s privileges system. The coherence between these different dimensions rests on the concept of governmentalization. This concept illustrates the reconfiguration of power resulting from the “detotalitarization” of prison. Such an approach sheds light on a “post-disciplinary” prison model that constitutes a significant shift in the punishment project described by Michel Foucault in Discipline and Punish. The post-disciplinary prison model nevertheless shows the perspicacity and soundness of the philosopher’s initial inspirations: prison endures as the mirror of the subjectification performed in the name of modern freedom.