What do we know about preventing drug-related harm through social developmental intervention with children and young people

This chapter examines the evidence for the effectiveness of interventions aiming to reduce drug-related harm by improving conditions for healthy develeopment in the earliest years through adolescence. Of the interventions beginning prior to birth, there is efficacy evidence that family home visitation is a feasible strategy for implementation with disadvataged families and can reduce risk factors for early developmental deficits and thereby improve childhood development outcomes. There is efficacy evidence for strategies such as parent education and school preparation through the pre-school age period. Some of the strongest evidence for efficacy in reducing developmental pathways to drug-related harm comes from interventions delivered through the early school years to improve educational environments. Of the interventions targeting the high school age period, school drug education has been the most commonly evaluated. The evidence suggests that short term reduction in both drug use and progression to frequent drug use may be achievable through this strategy, but the prospects for longer-term and population-level behaviour change is still unclear. In overview, a range of prevention strategies have been developed and evaluated. Most of the exisiting evidence is restricted to efficacy studies and there are future challenges to progress evaluation through to studies of effectiveness. In general, prevention programmes appear more successful where they maintain intervention activities over a number of years and incorporate more than one strategy. Much of the existing research has been based in North America and evaluates discrete programmes. Future research should test effects in other countries, in different social contexts and seek to better understand the interrelated effects of combining interventions within the community. Developmental prevention programmes target different age periods and social settings, hence communities have the challenge of coordinating a mixture of programmes that address the local conditions that adversely influence child and youth development. There are opportunities in this work to coordinate prevention activities using funding from different jurisdictions (e.g., crime prevention, health promotion, mental health, education, substance abuse prevention).