There's an elegant paper and analysis that addresses this in Minneapolis, another city that's had some DOJ attention for policing. https://lawandinequality.org/2020/11/24/does-the-minneapolis...

The TLDR is that you can analyze the difference between stops on summer evenings (sunny) and winter evenings (dark) and detect a racial bias depending on whether officer can see the driver or not. The raw data is also available through Minneapolis' Open Data website, so you can repeat the analysis yourself.