The São Paulo Public Ministry has opened a civil inquiry to look into the legality of the current operating hours of the metro and the CPTM trains, which close at midnight on Saturdays. This measure was originally implemented during the pandemic but has continued post-pandemic. The investigation was prompted by complaints from federal deputy Erika Hilton and councilwoman Amanda Paschoal, both members of the PSOL party, who argue that the reduced hours violate constitutional rights to transportation, particularly affecting night workers, residents of periferia (poor outskirts), women, and people with disabilities.

The two parliamentarians have requested that all metro lines, including private ones, along with CPTM services, be allowed to operate until 1 AM on Saturdays. They contend that the elimination of the final operational hour particularly harms marginalized communities who rely on public transport for late-night employment. Despite a reported drop in demand since the pandemic, they emphasize that Saturdays still account for around 60% of the usual weekday passenger volume, indicating a significant public need for extended service hours, especially for industries such as hospitality and dining.