This is taken somewhat out of context. First, she pulled him over as a training example.

Second, she is a trainer.

Third, how much skin color bias was involved in the whole matter from what side of town she was on, to who she pulled over and why, to would she have gotten it wrong with a White person, and has anyone ever done something so incompetent like that who was trainer and an officer for over two decades?

Finally, any one case can be weasled out of as not really, truly, surely racist, like an insurance company saying it was 77% inexplicable, and "only" 23% racist, so you are not at fault. But in reality the overall data for biased policing/legal system is damning. Why? So we screw up a few White lives, by calling it wrong a few times. When we screw up thousands up thousands of Black lives each year.

How many hundreds of thousands of years before White people could say one word about our concerns, if we ended all Black Americans getting wrongfully stopped/killed/arrested/incarcerated now, but kept screwing over a few White lives each year?

Bias works from a very deep place. And our color bias comes from an even deeper and scarier, more terrible place, insidiously cultivated for 400 years.