Contamination of domestic dwellings from methamphetamine cooking or smoking is an increasing public health problem in many countries. To evaluate the extent of contamination, sampling generally focusses on the collection of surface wipe samples from walls and other surfaces of a potentially contaminated home. Here, we report the contamination levels of many household materials and items sampled from a home that was suspected to be the premises used to cook methamphetamine, it was then sold, lived in for several years by the new owners and then left unattended for several more years. Although the time since the cooking had taken place was significant (over five years), the levels of contamination were extremely high in both household items that were part of the house when cooking was taking place (blinds, carpets, walls, etc.) and also in articles brought to the house post-cooking (rugs, toys, beds, etc.). Both wipe sampling and analysis of bulk samples indicate that the methamphetamine is not breaking down or being removed and is transferred from contaminated to non-contaminated objects. These results raise questions about the adequacy of characterising contamination and of making decisions about the extent of remediation required based solely on surface wipe samples. Without fully understanding the extent of contamination that is present, not only on surfaces but within the building materials, it is difficult to ensure that the correct and most effective remedial approaches are taken to appropriately determine and address the risks to inhabitants.
Contamination of residential homes with methamphetamine is an emerging issue of significant concern to public health. Cooking or smoking methamphetamine in a residential property contaminates the house, furnishings and personal possessions within it, with subsequent exposure through ingestion, dermal absorption and/or inhalation causing adverse health effects. Current guidelines identifying levels of methamphetamine contamination that require remediation vary between countries. There is also no international standard protocol for measuring levels of contamination and research has shown that different materials give rise to different recovery rates of methamphetamine. There are a number of currently used remediation methods; however, they have varying levels of success with limited studies comparing their long-term efficacies. Most importantly, there are few guidelines available that are based on a transparent, health risk-based approach, and there are many uncertainties on exposures and health effects, making it difficult to ensure the health of people residing in homes that have been used to cook or smoke methamphetamine are sufficiently protected. This manuscript presents the current state of knowledge regarding the contamination of residential homes with methamphetamine and identifies the current gaps in knowledge and priority areas for future research. The current regulatory approach to public health protection associated with exposure to residential premises contaminated with methamphetamine in Australia, New Zealand and the USA is also discussed.
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