Parliamentary Inquiry Commissions (CPIs) in Brazil serve as a crucial instrument for legislative investigation, allowing minority parties to investigate crimes against the public interest. A CPI can be initiated by a third of the legislative body when there are suspicions of unlawful conduct affecting public finances or social order. They possess the authority to summon individuals, break confidentiality, and request documentation, making them powerful mechanisms for accountability.

Historically, various CPIs have made significant contributions to Brazilian governance, such as the CPI that investigated former President Fernando Collor, which uncovered extensive corruption and helped trigger his impeachment. Another notable case was the CPI of Football, which revealed irregularities in the sport and led to the establishment of the Statute of the Fan. Additionally, the São Paulo CPI involving municipal inspectors identified a structured extortion network within city administration, aiding efforts to combat this corruption.

However, the article suggests that in recent times, some CPIs have gained less attention for their impactful findings and may be seen as less effective in pursuing accountability for public interest violations. This decline in prominence raises questions about the future effectiveness and role of CPIs in addressing corruption and maintaining the integrity of public institutions in Brazil.