What can you do if a police officer is abusing his authority?

lets say you are being arrested unjustly, or assaulted. like this guy http://www.youtube.com/watch?v=WYDw1Za8F-I&NR=1 I know, there maybe some details we don't know about, but lets just base it off that. Or what about if you're being attacked? Can you fight back if you're being legitimately assaulted? show more lets say you are being arrested unjustly, or assaulted. like this guy http://www.youtube.com/watch?v=WYDw1Za8F-I&NR=1 I know, there maybe some details we don't know about, but lets just base it off that. Or what about if you're being attacked? Can you fight back if you're being legitimately assaulted?
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