http://www.brasil.gov.br/news/history/2012/04/26/foreign-police-will-assist-with-world-cup-security

In a public audience held this Tuesday morning (April 24), José Gomes Monteiro Neto, aid to the Special Security Secretary for Major Events at the Ministry of Justice, gave details of Brazil's preparations for the FIFA World Cup in Brazil in 2014.
According to Monteiro, foreign agents without police power will work alongside Brazilian colleagues in initial questioning of tourists from their home countries. "If we have an occurrence involving a German citizen, for example, I will have a uniformed German police officer available who speaks their language to make the initial contact, however without police powers. He will be accompanied by a Brazilian police officer" he said.
The aide also detailed intelligence actions involving information on foreign fans with a history of violence in their home countries. "The presence of violent fans in Brazil, with a history of violence in their home stadiums, is not in our interests. We are therefore requesting information on these people from other countries", he said.
In relation to the legacy these large-scale events leave in the area of security, Monteiro mentioned integration between the country's security forces. "We have integration of Federal and State databases, such that police at border crossings can take the necessary steps to control people wishing to enter Brazil. This also allows police in active service at major events to quickly identify both Brazilians and foreign [troublemakers]", he said.
"We have to come away from these events with our security forces integrated, this is the greatest legacy that the Ministry of Justice wants to leave the country. We need to improve the public security that exists today in Brazil", he added.
Source:
World Cup Site