Justice should be blind in terms of punishment. Easy show systemic racism by looking at the number of African Americans in jail for drug offenses for drug when comparing across races. Drug use by race is relatively consistent in terms of percentage. I would consider that a big problem with our justice system.
My understanding is those "usage rates" are uniform only if we look at "used in last year", but ignore "used in last week" metrics where they diverge (according to Bureau of Justice Statistics). SSC did a pretty good deep dive on race and the criminal justice system, that covers this and other things such as underreporting, below:
