I'm struggling to find the data right now, but I believe the source was Phillip Atiba Goff. The tl;dr is that Black people are treated violently by police at a rate of several times that of white people, even once you control for socioeconomic status.
https://engineering.stanford.edu/magazine/article/black-driv...
> First, they narrowed the range of variables they had to analyze by choosing a specific time of day — around 7 p.m. — when the probable causes for a stop were more or less constant. Next, they took advantage of the fact that, in the months before and after daylight saving time each year, the sky gets a little darker or lighter, day by day. Because they had such a massive database, the researchers were able to find 113,000 traffic stops, from all of the locations in their database, that occurred on those days, before or after clocks sprang forward or fell back, when the sky was growing darker or lighter at around 7 p.m. local time.
> This dataset provided a statistically valid sample with two important variables — the race of the driver being stopped, and the darkness of the sky at around 7 p.m. The analysis left no doubt that the darker it got, the less likely it became that a black driver would be stopped. The reverse was true when the sky was lighter.
I found several studies by Phillip Atiba Goff that did NOT control for SES. (Easy to find a statistically significant result when you ignore confounding variables!) But none that did.
[1] https://sci-hub.ee/10.1177/1948550616633505 [2] https://www.annualreviews.org/doi/full/10.1146/annurev-lawso... [3] https://sci-hub.ee/10.1007/s10940-020-09471-9
[1] https://deathpenaltyinfo.org/news/report-black-people-7-5-ti...
[2] https://www.ussc.gov/research/research-reports/demographic-d...