First use of facial-recognition glasses at a sports event

In 2011, police in Brazil began testing facial-recognition glasses in early preparation for the 2014 World Cup. Almost undetectable to the casual observer, the glasses were fitted with a small camera that captured 400 facial images per second and compared these with a database of 13 million faces. In the event that the data matched up to a criminal, a red signal would appear on a small screen connected to the glasses, prompting the officer to take action. Major Leandro Pavani Agostini of Sao Paulo's Military Police was quoted as saying: "It's something discreet because you do not question the person or ask for documents. The computer does it. To the naked eye two people may appear identical but with 46,000 points compared, the data will not be beaten. I can insert into the database a supporter who was involved in a brawl on the field and even with the old images, he can be located in the future."