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These prosecutors use a cost-benefit analysis and it's : do we go after a police officer for what is criminal conduct and really diligently pursue the case and get a conviction and take the risk of losing the support of our key witnesses on hundreds of other cases, or do we basically sack the case, when you bring in an independent body to come in and basically put all the resources into holding the officer accountable, that you're actually going to get a situation where a trial is put together that really does present all the evidence objectively.