Introduction In 2017, Canada increased alcohol excise taxes for the first time in over three decades. In this article, we describe a model to estimate various effects of additional tax and price policies that are predicted to improve health outcomes. Methods We obtained alcohol sales and taxation data for 2016/17 for all Canadian jurisdictions from Statistics Canada and product-level sales data for British Columbia. We modelled effects of alternative price and tax policies - revenue-neutral taxes, inflation-adjusted taxes and minimum unit prices (MUPs) - on consumption, revenues and harms. We used published price elasticities to estimate impacts on consumption and revenue and the International Model for Alcohol Harms and Policies (InterMAHP) to estimate impacts on alcohol-attributable mortality and morbidity. Results Other things being equal, revenue-neutral alcohol volumetric taxes (AVT) would have minimal influence on overall alcohol consumption and related harms. Inflation-adjusted AVT would result in 3.83% less consumption, 329 fewer deaths and 3762 fewer hospital admissions. A MUP of $1.75 per standard drink (equal to 17.05mL ethanol) would have reduced consumption by 8.68% in 2016, which in turn would have reduced the number of deaths by 732 and the number of hospitalizations by 8329 that year. Indexing alcohol excise taxes between 1991/92 and 2016/17 would have resulted in the federal government gaining approximately $10.97 billion. We estimated this could have prevented 4000-5400 deaths and 43 000-56 000 hospitalizations. Conclusion Improved public health outcomes would be made possible by (1) increasing alcohol excise tax rates across all beverages to compensate for past failures to index rates, and (2) setting a MUP of at least $1.75 per standard drink. While reducing alcohol-caused harms, these tax policies would have the added benefit of increasing federal government revenues.

People who use drugs are disproportionately represented in the criminal justice system in Canada; how they come to be in contact with this system is typically through encounters with police. Understanding the nature of encounters between people who use drugs and police is vital to developing interventions and policing practices that are appropriate, fair, and promote the well-being of this community. This study quantitatively and qualitatively examines police encounters from the perspectives of youths and adults who use drugs in Victoria, British Columbia. The results show divergent predictors of police encounters and perceptions of these encounters based on age cohort. Youths were more likely to report police encounters and were more likely to perceive these encounters as negative compared with the adult cohort. Among both age groups, unstable housing was a significant predictor of reporting a recent encounter with the police. Among adults only, opioid use was a significant predictor of negative encounters. The qualitative findings show that negative perceptions were largely due to police harassment, being labelled as a person who uses drugs, and interference with drug paraphernalia. These findings also show that mutual respect and relationships built over time contribute to more positive reports of encounters. There were also many reports of positive experiences despite legal interference. These results suggest that people who use drugs belong to a group that are labelled and discriminated against, but that relationship building between people who use drugs and police can have a positive impact. These results may inform local policing practices and cultures, which can promote the health and well-being of the community.

BackgroundRespondent-driven sampling (RDS) is an increasingly used peer chain-recruitment method to sample “hard-to-reach” populations for whom there are no reliable sampling frames. Implementation success of RDS varies; one potential negative factor being the number of seeds used.MethodsWe conducted a sensitivity analysis on estimates produced using data from an RDS study of gay, bisexual and other men who have sex with men (GBMSM) aged ≥16 years living in Vancouver, Canada. Participants completed a questionnaire on demographics, sexual behavior and substance use. For analysis, we used increasing seed exclusion criteria, starting with all participants and subsequently removing unproductive seeds, chains of ≤1 recruitment waves, and chains of ≤2 recruitment waves. We calculated estimates for three different outcomes (HIV serostatus, condomless anal intercourse with HIV discordant/unknown status partner, and injecting drugs) using three different RDS weighting procedures: RDS-I, RDS-II, and RDS-SS. We also assessed seed dependence with bottleneck analyses and convergence plots. Statistical differences between RDS estimators were assessed through simulation analysis.ResultsOverall, 719 participants were recruited, which included 119 seeds and a maximum of 16 recruitment waves (mean chain length = 1.7). The sample of >0 recruitment waves removed unproductive seeds (n = 50/119, 42.0%), resulting in 69 chains (mean length = 3.0). The sample of >1 recruitment waves removed 125 seeds or recruits (17.4% of overall sample), resulting in 37 chains (mean length = 4.8). The final sample of >2 recruitment waves removed a further 182 seeds or recruits (25.3% of overall sample), resulting in 25 chains (mean length = 6.1). Convergence plots and bottleneck analyses of condomless anal intercourse with HIV discordant/unknown status partner and injecting drugs outcomes were satisfactory. For these two outcomes, regardless of seed exclusion criteria used, the crude proportions fell within 95% confidence intervals of all RDS-weighted estimates. Significant differences between the three RDS estimators were not observed.ConclusionsWithin a sample of GBMSM in Vancouver, Canada, this RDS study suggests that when equilibrium and homophily are met, although potentially costly and time consuming, analysis is not negatively affected by large numbers of unproductive or lowly productive seeds.Electronic supplementary materialThe online version of this article (doi:10.1186/s12874-016-0258-4) contains supplementary material, which is available to authorized users.

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