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On Location Video: World Cup 2014 will basically be a giant robotics show

Rio, like Sochi, is having to get inventive to ensure safety. Will it work?

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A police drone flies over a protest in Rio de Janeiro (Edgar Costa/GlobalPost)

RIO DE JANEIRO, Brazil — With simmering protests, a surge in violence and less than three months to go till the World Cup, Rio de Janeiro police have introduced a host of new tactics that seem right out of science fiction.

Each hosting city has spent about $90 million on surveillance drones, explosive-detecting robots, camera glasses and other equipment.

But is it making the city safer?