AdvertisementNeedle Exchanges Often Overlooked In AIDS FightJuly 24, 2012Richard KnoxfacebookEmailA heroin user keeps a syringe tucked behind his ear at a park in the city of Medan on Indonesia's Sumatra island. Cordita-Caritas Medan, a nongovernmental organization active there, works to reduce HIV infections through rehab of drug users and a needle exchange program. (AFP/Getty Images)