Homicide rates are unlikely to have this kind of bias though. And they're heavily against blacks. It's unlikely whites being murdered go unreported, or that anyone gets off with a warning. But inner city homicide has a low solving rate. If the reporting rate is also lower, then it could be even worse than the 4-7x overrepresentation of blacks in homicide.

This seems to be the case in London, too, so it's a bigger issue than just the US.

But for things like drug possession, yes, blacks probably get stopped much more and not let off with warnings much less.