I did see this in my local paper. It caught my interest because my daughter is in Rio going to school for a year. I'm scheduled to visit her in July.
The favelas (slums) are a completely different world down there. The hillsides around Rio are filled with the shacks and shanties of the dispossessed. No water, no utilities, no rent, no services. Only the drug gangs to provide security. Even the police will only enter in squad-sized forces. It's a veritable war zone.
My daughter is teaching English in a favela somewhere in Rio.