the history of the organization of the drug and weapon trade inside the favelas of rio is well documented in a number of media sources including books, statistics and websites.

titled 'youth, violence, and drug trafficking in rio de janeiro' the work by renowned anthropologist alba zaluar, summarizes some of the most important crime-related indicators and presents them in a very understandable way in her presentation on this link.   

the sociological dimension of the drug-traffic in the favelas of rio de janeiro by ricardo vélez rodríguez coordinator of the strategic research center 'paulino soares de sousa' of the - federal university of juiz de fora) presents a brief history of how the drug trading evolved in rio de janeiro from the 1950's to 2003. - more resources can be found in the section about books.