The right kind of data would come from things like the National Crime Victimization Survey which collects data outside the criminal justice system. The base rate for the offender in a violent crime being black, is, according to that survey, lower than the probability that a given person arrested for a violent crime is black. So it looks to me that the evidence is long screened out by the time the case gets to the court room.
Note that the NCVS requires that the victims survive, and does not collect data on crimes like murder, which may cause systematic differences.
This thread is for discussing anything that doesn't seem to deserve its own post.
If the resulting discussion becomes impractical to continue here, it means the topic is a promising candidate for its own thread.