No, you'd just need to keep track of how often demographic considerations influenced the outcome, so that any measure of "base rates for violence among blacks" you use for such decisions is independent of the policy.
(That's not to say that such a policy would be a good idea of course)
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.