RIO DE JANEIRO (AP) — Dressed immaculately, the evangelical preachers head out to work when night falls. They journey through the gloom into the “cracklands” where addicts consume crack cocaine in open-air dens, areas well hidden from the eyes of tourists heading to Rio de Janeiro for the World Cup.

After midnight, hundreds of grime-covered addicts lie on the sidewalks of the Jacarezinho slum. They focus on little more than the next fix, on finding a lighter to put flame to pipe.