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This only works if you're aware that race is even a factor. If you're not aware of the problematic factors, then you can't correct for them.

How do you know you have the correct model, and isn't making the system more racist instead of less?

Machine learning is also very opaque.

But if the racial factors aren't all the same, then that creates an incentive for people to lie about their race.

If you verify the race field, then now you're in the business of enforcing racial definitions.