[AnimalMuppet]

My assertion was that a perfect algorithm, fed biased data, produces biased results. Given Ferguson, etc., data from the justice system may be biased, at least for some locations.

If the arresting officers are biased, the number of arrests are probably biased. I'm not sure that you can fix that with better data collection methods; the problem isn't with the data collection. The problem also isn't with the analysis.

It may be possible, at least in theory, to create an algorithm that will determine whether the officers are biased, or whether the race in question actually commits more crimes. I'm not optimistic about that working in reality, though.