Brazilian police can scan hundreds of faces per second with a pair of sunglasses

The 2014 World Cup is going to be in Brazil, and preparations are
already underway. Security is going to be tight at this event, and I
have heard that the police will have something to protect the innocent
like Robocop.

The plan is that the police will be wearing sunglasses with cameras
that can scan 400 known criminals per second from up to 12 miles away
(they are generally optimized