How can we understand the troubling under-inclusiveness of our law of mental disorder – its failure to recognize mental conditions that, on the most compelling theoretical accounts of how mental disorder operates on criminal responsibility, ought to concern us deeply? This article argues that the gap between our plausible theories of criminal responsibility and our practices relating to mental disorder is best understood as a marker for the criminal law’s central social function: the laundering and containment of blame. The article begins by canvassing the conceptual structure of the defence of mental disorder, turning then to the troubling prevalence of mental disorder among those facing criminal judgment, looking specifically at the incid...