The Stanford Open Policing Project contains approximately 200 million data points on police stops in the US. The data are made available under the Open Data Commons Attribution License.
[ DATA CATALOG ]
For details see the working paper:
E. Pierson, C. Simoiu, J. Overgoor, S. Corbett-Davies, D. Jenson, A. Shoemaker, V. Ramachandran, P. Barghouty, C. Phillips, R. Shroff, and S. Goel. (2019) “A large-scale analysis of racial disparities in police stops across the United States”.