Officers of the Metropolitan Civil Guard patrol a street in downtown Sao Paulo, Brazil, on February 25, 2026. In the heart of Sao Paulo, a "prisonometer" keeps a live tally of people jailed due to Latin America's largest AI facial-recognition system, but its successes have been marred by mistaken arrests. The digital counter stands outside the Smart Sampa monitoring center, where dozens of police officers watch images streaming in from 40,000 cameras in the Brazilian megalopolis. (Photo by Nelson ALMEIDA / AFP via Getty Images)