In the bustling metropolis of São Paulo, a digital “prisonometer” tracks in real time the number of individuals jailed through Latin America’s largest AI-powered facial recognition system. While authorities credit the technology with boosting public security, growing concerns over wrongful arrests and civil liberties are intensifying scrutiny of the program.
Expansive Surveillance Network
The system, known as Smart Sampa, was launched in 2024 to combat crime in Brazil’s largest city. It integrates a network of approximately 40,000 cameras, feeding live footage to a central monitoring hub where police compare images against judicial databases.
According to municipal security secretary Orlando Morando, the system has helped apprehend around 3,000 fugitives and catch nearly 4,000 individuals in the act of committing crimes. “With the fugitives the system captured, we could fill seven prisons,” Morando said, underscoring the program’s scale and impact.
The technology operates across public streets, government buildings, and even private premises that opt into the network, significantly expanding its surveillance reach across the city’s population of over 12 million residents.
Errors and Wrongful Arrests
Despite its successes, official transparency data indicates that more than 8 percent of individuals flagged as fugitives during the system’s first year were mistakenly identified and later released. At least 59 wrongful detentions have been attributed directly to facial recognition errors.
Reported incidents include the detention of an elderly man wrongly identified as a suspect in a sexual assault case, and the arrest of a psychiatric patient during a therapy session due to an outdated warrant. Authorities maintain that such cases were promptly corrected, emphasizing that no individual remained in custody after errors were identified.
However, critics argue that even temporary wrongful detention represents a significant violation of rights and highlights systemic flaws in the technology.
Debate Over Use and Scope
Civil society groups have questioned whether the system is being used primarily for public safety or broader social control. A report by the Liberdade legal network suggests that a significant portion of arrests involve civil matters, particularly individuals detained over unpaid child support.
“Smart Sampa is presented as a solution to crime but is used for civil control,” said Amarilis Costa, a director at Liberdade and co-author of the report.
Authorities have rejected these claims, arguing that the system contributes to tangible security gains. The São Paulo government reports a nearly 15 percent drop in robberies in 2025, attributing part of the decline to the surveillance initiative.
Concerns Over Bias and Transparency
Another area of concern is the lack of comprehensive demographic data. More than half of those identified and arrested through the system do not have recorded racial data, making it difficult to assess potential bias.
Experts warn that facial recognition technologies globally have shown higher error rates among darker-skinned populations, raising concerns about possible “algorithmic racism” in a country with a large Black population.
City officials maintain that the system operates without prejudice, stating that arrests are based solely on database matches rather than physical characteristics.
Balancing Security and Rights
As São Paulo continues to grapple with high crime rates including a significant share of Brazil’s mobile phone thefts the adoption of advanced surveillance tools reflects a broader global trend toward technology-driven policing.
However, the debate surrounding Smart Sampa underscores the challenge of balancing enhanced security with the protection of civil liberties, accuracy in law enforcement, and public trust in emerging technologies.
