It's not whataboutism, it raises a good point: What's the best we can do with regard to weeding out bad cops? Like, what does doing a good job of that even look

It's not whataboutism, it raises a good point: What's the best we can do with regard to weeding out bad cops? Like, what does doing a good job of that even look like? The ideal is obviously 'no bad cops' but everyone here can agree that's not really achievable, so what does doing a reasonable, or even great job look like. How many bad cops are on the force if we do everything we can?