I tried to keep these numbers within the context of cannabis. The 663K arrests in 2018 refer to cannabis only related arrests. The ACLU mentions how cannabis us

I tried to keep these numbers within the context of cannabis. The 663K arrests in 2018 refer to cannabis only related arrests. The ACLU mentions how cannabis use is approximately equivalent between white and black people: https://norml.org/marijuana/fact-sheets/item/racial-disparity-in-marijuana-arrests https://norml.org/marijuana/fact-sheets/item/racial-disparit... Frequency is a hard one and can be muddled a bit. There isn't great data on the frequency or quality of usage of racial differences.