Injection drug use (IDU) and methamphetamine smoking are associated with the majority of illicit drug-related harms and associated costs in Australia. We will extend our studies of people who inject drugs and people who smoke methamphetamine through record linkage to social and criminal justice datasets. We will characterise the trajectories of participants through social services (e.g. public housing) and law enforcement systems to provide a comprehensive account of social and criminal justice impacts of injection drug use and methamphetamine use in Australia for the first time.