You’ll find tutorials that walk you through the steps to understand the data yourself, and information on a new statistical test of discrimination developed as part of this project. On this site, you can explore our results. But, in some cases, we find evidence that bias also plays a role. These disparities can occur for many reasons: differences in driving behavior, to name one. The result? The project has found significant racial disparities in policing. Police departments, comprising nearly 100 million traffic stops, are sufficiently detailed to facilitate rigorous statistical analysis. Even when states do provide the information, the way they track and then process the data varies widely across the country, creating challenges for standardizing the information.ĭata from 21 state patrol agencies and 29 municipal States that do collect the information don’t always release the data. Some states don’t collect the demographic information of the drivers that police pull over. To date, the project has collected and standardized over 200 million records of traffic stop and search data from across the country.Ĭreating this resource has been marked by challenges. Starting in 2015, the Open Policing Project began requesting such data from state after state. The Stanford Open Policing Project - a unique partnership between the Stanford Computational Journalism Lab and the Stanford Computational Policy Lab - is changing that. Yet the most common police interaction - the traffic stop - has not been tracked, at least not in any systematic way. Police pull over more than 50,000 drivers on a typical day, more than 20 million motorists every year.
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