Reprint of the fourth edition, which contains an additional text attributed to Voltaire. Originally published anonymously in 1764, Dei Delitti e Delle Pene was the first systematic study of the principles of crime and punishment. Infused with the spirit of the Enlightenment, its advocacy of crime prevention and the abolition of torture and capital punishment marked a significant advance in criminological thought, which had changed little since the Middle Ages. It had a profound influence on the development of criminal law in Europe and the United States.

The Catholic Church has in recent decades been associated with political efforts to eliminate the death penalty. It was not always so. This timely work reviews and explains the Catholic Tradition regarding the death penalty, demonstrating that it is not inherently evil and that it can be reserved as a just form of punishment in certain cases. Drawing upon a wealth of philosophical, scriptural, theological, and social scientific arguments, the authors explain the perennial teaching of the Church that capital punishment can in principle be legitimate—not only to protect society from immediate physical danger, but also to administer retributive justice and to deter capital crimes. The authors also show how some recent statements of Church leaders in opposition to the death penalty are prudential judgments rather than dogma. They reaffirm that Catholics may, in good conscience, disagree about the application of the death penalty. Some arguments against the death penalty falsely suggest that there has been a rupture in the Church's traditional teaching and thereby inadvertently cast doubt on the reliability of the Magisterium. Yet, as the authors demonstrate, the Church's traditional teaching is a safeguard to society, because the just use of the death penalty can be used to protect the lives of the innocent, inculcate a horror of murder, and affirm the dignity of human beings as free and rational creatures who must be held responsible for their actions. By Man Shall His Blood Be Shed challenges contemporary Catholics to engage with Scripture, Tradition, natural law, and the actual social scientific evidence in order to undertake a thoughtful analysis of the current debate about the death penalty.

Many studies during the past few decades have sought to determine whether the death penalty has any deterrent effect on homicide rates. Researchers have reached widely varying, even contradictory, conclusions. Some studies have concluded that the threat of capital punishment deters murders, saving large numbers of lives; other studies have concluded that executions actually increase homicides; still others, that executions have no effect on murder rates. Commentary among researchers, advocates, and policymakers on the scientific validity of the findings has sometimes been acrimonious. Against this backdrop, the National Research Council report Deterrence and the Death Penalty assesses whether the available evidence provides a scientific basis for answering questions of if and how the death penalty affects homicide rates. This new report from the Committee on Law and Justice concludes that research to date on the effect of capital punishment on homicide rates is not useful in determining whether the death penalty increases, decreases, or has no effect on these rates. The key question is whether capital punishment is less or more effective as a deterrent than alternative punishments, such as a life sentence without the possibility of parole. Yet none of the research that has been done accounted for the possible effect of noncapital punishments on homicide rates. The report recommends new avenues of research that may provide broader insight into any deterrent effects from both capital and noncapital punishments.