The "drug crimes per interaction" rate doesn't work for this case either, if the number of interactions is just too low. And if you look at real numbers, in the

The "drug crimes per interaction" rate doesn't work for this case either, if the number of interactions is just too low. And if you look at real numbers, in the US, for example, we're talking a difference in the order of two magnitudes. So if any person has a 10% chance to carry an illegal drug and you search 100 black dudes and 1 white dude, chances are your drug crimes per interaction will be 0 with the white dude and about 10% with the black dudes. Now add to that, that the white dude is much more likely to get off with a warning that's not committed to protocol and there we are.