Over the past decades, prosecutors have become more and more powerful within criminal justice systems. Yet, there is still relatively little empirical research on prosecutors. Most of the literature focuses on the analysis of the prosecutorial system of a single country. Cross-country analyses are close to nonexistent.
From a comparative perspective, the various possible means to establish the independence of prosecutors from government and at the same time securing their accountability to the law are of paramount interest. Regarding the former, appointment procedures, possible career paths, and the degree to which prosecutors are subject to orders both from within the prosecution agency as well as from without (e.g., the ministry of justice) are of special concern. With regard to prosecutorial accountability, it is the legality principle (also known as mandatory prosecution), the issue whether prosecutors enjoy a monopoly in the prosecution of criminals, whether decisions not to prosecute a suspect are subject to judicial review, and the transparency of the behavior of prosecutors that are key.
Regarding the organizational design choices of prosecution agencies that have been implemented across countries, four different clusters can be identified. The four clusters perform markedly different in terms of the rule of law levels associated with them.
The consequences of institutional design choices are surprisingly small. The de facto organization of prosecutors turns out to be far more relevant for outcomes than what is prescribed de jure. Countries in which prosecutors enjoy a high degree of de facto independence suffer significantly less from corruption than countries in which this is not the case.
Given that the institutional design choices of prosecutors are of limited relevance for their de facto situation, the question is: What factors determine the de facto independence and accountability of prosecutors? It turns out that some rather stable and immutable factors are decisive: Common law legal systems do better than those belonging to the civil law legal families. Generalized trust also plays an important role. If most people believe that others can be trusted, very specific rules for the behavior of prosecutors may seem unnecessary.
A number of trends regarding the organization of prosecutors can be observed in many countries, among them the increased reliance on trial waiver systems, bonus payments to incentivize prosecutors, the founding of prosecutorial councils, and prosecutorial activism. It is questionable whether the first three of these trends will increase the efficiency of prosecution agencies; rather, they are likely to lead to a deterioration in the overall rule of law score of those countries relying on them.