By Michael Sanders, Kate Bancroftb, Susannah Humea, Oliver Chetwyndc and Paul Quintonca

We aim to test the impact of a new national curriculum for public and personal safety training (PPST) developed by the College ofPolicing, which aims to reduce the use of force by police. We con-duct a large-scale Stepped Wedge Pragmatic Controlled Trial with a single police force and 1843 participating police officers.Officers were assigned to be trained during a particular week of the year. We find statistically significant reductions in the use of force by police officers as a result of the training. These effects are a reduction of between 8.0% and 10.9% in the propensity to use force in a given week compared to the counterfactual. The Effect is accompanied by a significant reduction in the likelihood of injury to civilians, and no rise in the risk of harm to officers.We conclude that the PPST curriculum appears effective at reduc-ing use of force by police in a large scale, robust trial