At about the same rates, in fact. And yet, arrests are way higher for black people (in Iowa it's like 8 times higher).

The war on drugs is also a good tool to oppress poor white people, but the data on this one are really stark. Prohibition is a major tool of racial oppression in the US.

I think the point was that it's extremely hard to prove that a cop didn't smell something, so they can see a black person, lie and say they smell weed and have 0 consequences for harassing them.