I have discussed it many times....but people like you reject it, mostly because the data is fixed to be relative to the crimes committed, which is a horrible way to fix the data.
https://www.hrw.org/report/2009/03/02/decades-disparity/drug-arrests-and-race-united-states
One example...Even though drug use is about the same, blacks are arrested at 3-6x the rate, and the incarceration rate is also higher.