Two that I know of certainly were debateable. I've seen some bad, ****ed up **** done by cops, and I've seen them lie their asses off on the stand. And no one that I know of has EVER been satisfied when challenging police behavior through the "proper channels".
So without some kind of data to back up your position, I will remain skeptical.
The ghost of Jack Kevorkian for President's Physician: 2012
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If it were a level playing field, then I would say it would be up to jury selection.