Investigates the effect of substance use on mental health states, with particular focus on the relationship between methamphetamine use and symptoms of depression, anxiety, psychosis, and aggression.   We are currently working with the local government to survey individuals in the ACT of whom frequently use methamphetamine to estimate the extent of methamphetamine dependence in the local region, document the health and wellbeing of people in this population, and understand barriers to their accessing treatment and other health services.