It is impossible for black people to be racist because they are not in authority.
OH !
More accurately, the postmodern inspired formula for the redefinition of racism is power + prejudice = racism. That works for them at the individual level and the systemic level. And I would agree with that definition in terms of systemic racism. For example, a majority race creates laws or policies which establishes a privileged class for the majority race and oppresses the minority race--clearly slavery was that. That is systemic racism, and the power + prejudice = systemic racism certainly works in that case. However, in this case, to them, the justice system that she is a part of was devised by white people, so black people in it can't possibly be systemically racist.