Human rights prosecutions have been the major policy innovation of the late twentieth century designed to address human rights violations. The main justification for such prosecutions is that sanctions are necessary to deter future violations. In this article, we use our new data set on domestic and international human rights prosecutions in 100 transitional countries to explore whether prosecuting human rights violations can decrease repression. We find that human rights prosecutions after transition lead to improvements in human rights protection, and that human rights prosecutions have a deterrence impact beyond the confines of the single country. We also explore the mechanisms through which prosecutions lead to improvements in human rights. We argue that impact of prosecutions is the result of both normative pressures and material punishment and provide support for this argument with a comparison of the impact of prosecutions and truth commissions, which do not involve material punishment.

Democratizing states began in the 1980s to hold individuals, including past heads of state, accountable for human rights violations. The 1984 Argentine truth commission report (Nunca Más) and the 1985 trials of the juntas helped to initiate this trend. Argentina also developed other justice-seeking mechanisms, including the first groups of mothers and grandmothers of the disappeared, the first human rights forensic anthropology team, and the first truth trials. Argentines helped to define the very term forced disappearance and to develop regional and international instruments to end the practice. Argentina thus illustrates the potential for global human rights protagonism and diffusion of ideas from a country outside the wealthy North. This article surveys Argentina's innovations and proposes possible explanations, drawing on theoretical studies from transitional justice, social movements, and norms cascades in international relations.

Since the 1980s, states have been increasingly addressing past human rights violations using multiple transitional justice mechanisms including domestic and international human rights trials. In the mid-1980s, scholars of transitions to democracy generally concluded that trials for past human rights violations were politically untenable and likely to undermine new democracies. More recently, some international relations experts have echoed the pessimistic claims of the early 'trial skeptics' and added new concerns about the impact of trials. Yet, relatively little multicountry empirical work has been done to test such claims, in part because no database on trials was available. The authors have created a new dataset of two main transitional justice mechanisms: truth commissions and trials for past human rights violations. With the new data, they document the emergence and dramatic growth of the use of truth commissions and domestic, foreign, and international human rights trials in the world. The authors then explore the impact that human rights trials have on human rights, conflict, democracy, and rule of law in Latin America. Their analysis suggests that the pessimistic claims of skeptics that human rights trials threaten democracy, increase human rights violations, and exacerbate conflict are not supported by empirical evidence from Latin America.

The 1980s & 1990s saw a shift in major international trends toward enforcing international judicial procedures in an effort to hold individual political actors responsible for crimes against humanity. Further, the embrace of foreign judicial procedures resulted in a "justice cascade" that now applies to all political leaders guilty of past abuses of human rights. It is contended that this cascade of norms is the result of the efforts of a transnational justice advocacy network, comprising connected groups of activist lawyers. The justice cascade is spreading throughout Latin America & other countries, & it is predicted that foreign human rights trials will have an important domestic effect.