Investigating the New Zealand policy response to methamphetamine-contaminated houses.

The contamination of houses from clandestine methamphetamine manufacture emerged as an issue in New Zealand in the early 2000s. This perspective reviews and discusses the series of policies developed to address methamphetamine contamination in New Zealand houses over a 15-year period, ending with the reversal of the established policy approach in 2018. The policies addressing methamphetamine contamination of New Zealand properties were influenced by a range of sources including overseas scientific guidelines, local scientific reviews, public housing agency policies, and the local methamphetamine testing industry. A post-remediation methamphetamine level of 0.5 µg/100 cm2 was initially implemented in 2010, leading to the termination of public housing tenancies, suspensions from the public housing list, and financial charges for decontamination on public housing tenants. Subsequent reviews of the policy led to some increase in the thresholds (up to 1.5-3.8 µg/100 cm2 ) and the adoption of less punitive sanction processes. A scientific review in 2018 recommended a substantial threshold increase to 15 µg/100 cm2 (a 30-fold increase on the 2010 standard), resulting in HNZ initiating a plan to compensate previously sanctioned tenants. Overreliance on the "precautionary principle"; strict interpretation of scientific guidelines; and the public housing agency's "zero tolerance approach" to drug use, contributed to an overly punitive policy approach to methamphetamine contamination in New Zealand that negatively impacted vulnerable public housing tenants, landlords, and property owners. Investigation into the extent that all possible influences had on the development of the policies, as well as the consequences of their implementation, should be undertaken.