More than 100 freedom of information (FOI) laws have been enacted worldwide, nearly half within the last 10 years. Yet these cross-domain, lynchpin transparency measures have received little scholarly attention. This article assesses the 16 FOI measures adopted across Latin America. Is secrecy being surrendered in a region marked by legacies of opacity? Why are some laws fulfilling their de jure potential in practice while others are not? This article aims to achieve 3 general objectives. It analyzes the de jure and de facto strength of Latin American FOI regimes; it exposes critical data-based and methodological challenges in evaluating and comparing transparency laws; and it illustrates how a causal mechanism, driven by the interactive dynamics of legislative balances of power and cabinet compositions, has had a determinate influence in shaping the strength of FOI regimes from adoption to implementation and reform.

The Mensalão trial was Brazil's most important political corruption trial ever and an emblematic ex post accountability success. More than 28 individuals were convicted in relation to a legislative vote-buying scheme, many by the very officials they helped appoint. We relay the trajectory of the scandal cum trial, explain its successful prosecution and assess its implications. The article argues that the Mensalão has proved pivotal for Brazil's institutional and legal advances and asks – more than a quarter of a century after a new constitution – whether the country is entering into a stronger, more enduring relationship with the rule of law.