How to respond justly to the dangers persistent violent offenders present is a vexing moral and legal issue. On the one hand, we wish to reduce predation; on the other, we want to treat predators fairly. The central theme of this paper is that it is difficult to achieve both goals without compromising one of them, and that both are being seriously undermined. I begin by explaining the legal theory, doctrine and practice governing dangerous offenders and demonstrate that the law (...) leaves a gap in the ability to confine them. Next I explore the means by which the law has overtly or covertly sought to fill the gap. Many of these measures, especially the new form of civil commitment for sexual predators, dangerously conflate moral and medical categories. I conclude that pure preventive detention is more common than we usually assume, but that this practice violates fundamental assumptions concerning liberty under the American constitutional regime. (shrink)

When does a defendant not deserve punishment because he is unaware that his conduct breaches a penal statute? Retributivists must radically rethink their answer to this question to do justice to our moral intuitions. I suggest that modest progress on this topic can be made by modeling our approach to ignorance of law on our familiar approach to ignorance of fact. We need to distinguish different levels of culpability in given mistakes and to differentiate what such mistakes may be about. (...) I discuss the advantages and disadvantages of this approach with special attention to how to contrast offenses from defenses. The alternative I tend to favor probably should not be implemented in existing penal codes. As a result, we are likely to remain dissatisfied with the decisions made by our criminal justice system about the exculpatory effect of ignorance of law. (shrink)