Evidence supports the need for a shift in the global approach to drug use. In this report, Do no harm: health, human rights and people who use drugs, UNAIDS shows what works to reduce the impact of HIV and other harms related to drug use. Countries that have moved away from laws and policies that are harmful to people who use drugs and that have increased investment in harm reduction have reduced new HIV infections and improved health outcomes. These policies also deliver broader social benefits, such as lower levels of drug-related crime and reduced pressure on health-care and criminal justice systems.