Rio favela has 'more CCTV cameras than London'
11 January 2013 Last updated at 17:07 GMT
Police in Rio de Janeiro have started using CCTV to watch communities in Rocinha, the city's biggest favela which they claim to have 'pacified' in 2011 when they expelled a large number of drug traffickers.
They say it is now the best monitored places in the world, with a higher ratio of cameras per resident even than London.
Residents and police spoke of what effect they think the cameras will have on the neighbourhood.