Faces of crack: Brazil Pictures Faces of crack: Brazil A young suspected crack user covers his face as he escorted by a social worker to a waiting van near the Parque Uniao slum in Rio de Janeiro, Brazil, Oct. 17, 2012. Health officials are locating and treating hundreds of crack addicts suddenly left without drugs after police occupied dangerous slums where the users congregated in masses to buy and smoke the potent drug. Credit: AP Photo/Felipe Dana