The criminal justice will never be fair or nondiscriminatory until it is administered by both black and white citizens, until prosecutors and jurors are forced routinely to deal with the experiences of black people and to factor those experiences into their decisions. There is no such thing as a race neutral decision in the criminal justice system, when it affects black people and when their voice is not part of the discussion leading to the decision. For example, it is clearly the case that blacks who murder whites are treated more harshly than are blacks who murder blacks. This looks like racial disparity if you assume that the circumstances are similar in the two cases. Unfortunately, it's vastly unlikely that they are.
Most murders are among people who know each other.
Murders done by strangers are much more likely to be regarded as heinous than are murders growing out of domestic quarrels, drug deals gone wrong, and such. It might seem reasonable to compare the punishment received by blacks who murder whites with the treatment received by whites who murder blacks. Unfortunately, while black on white crime is relatively rare, white on black crime is even rarer. There simply isn't an adequate statistical base to allow us to generalize about whites who murder blacks, which pretty much leaves us to compare the way the system treats blacks who murder blacks with the way it treats whites who murder whites. But even this finding is one we have to be skeptical about.