As the results of the randomised trials became clear, the World Health Organization switched its policy to favour free distribution of bed nets. It turned out that free bed nets were far more popular, and equally likely to be used (Cohen and Dupas 2010). So, a randomised trial tested the take-up and use of free versus cheap bed nets. In Africa, some economists argued that free anti-malarial bed nets would not be valued by villagers and might be used instead as makeshift fishing nets. Drug courts don’t just help addicts – they also make the streets safer. By treating their addiction, they became much less likely to reoffend than if they had been sentenced through the traditional criminal justice system. In New South Wales, a randomised trial of the Drug Court showed that a tailored approach to drug offenders reduced recidivism (Lind et al 2002). As a result, the planned national rollout has now been scrapped (Molloy 2023). The results, reported this year, showed no significant positive impact (Westlake et al 2023). Then researchers at Cardiff and Oxford Universities ran a two-year randomised trial across 300 schools to test the impact. Teachers, social workers and students all liked it. In Britain, pilots of social workers in schools showed that everyone liked the idea. Seeing inside a jail will deter juvenile delinquents from becoming criminals.Īll four statements sound perfectly sensible, don’t they? Unfortunately, randomised trials suggest that all four are perfectly wrong. Malaria bed nets are more likely to be used if people pay for them. Drug offenders shouldn’t be treated differently. Social workers in schools always boost student outcomes.
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