According to a Telegraph report, Brazilian police will be outfitted with eyeglasses that can scan 400 faces per second, identifying persons of interest with speed and ease. An excerpt:

“Military Police officials from Sao Paulo and Rio de Janeiro, which will both host key games in the World Cup, have been given demonstrations of how the device works.

Major Leandro Pavani Agostini, of Sao Paulo’s Military Police, said: ‘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.”