Australia (DUMA) survey, querying respondents in police custody about illicit drug use and its relationship to criminal activities combined with uri- nalysis components since 1999 (Coghlan et al. 2015). The AIHW National Drug Strategy Household Survey is another example (AIHW 2014), pro- ducing crucial estimates of illicit drug usage and harms across the community. In New Zealand, similar data are collected through the NZ Ministry of Health (2010, 2015).