http://www.nytimes.com/reuters/2009/09/28/world/international-britain-g20.html The biggest problem we have with police brutality is not sending the message of accountability. Police officers are often allowed to get away with making a mistake, sending the message to others that mistakes will often be tolerated. Right now, I believe that in order to decrease police brutality we need to set up cases of accountability. Showing officers world wide that if you mess up, we will hold you accountable and you will be punished. Being a police officer is not something to be taken lightly. You are in a position of authority and you should take that seriously. Not use your authority in a negative manner. Let's hope that this is the beginning of a trend of accountability among law enforcement.
Good luck on this one. This profession seems to attract a violent sort of person. I was watching a program on the Gestapo last night on the History Channel and it was interesting to learn that very few of the police officers that served as SS prison guards/torturers/killers ever served a day in prison for their crimes during WWII. And even when they are caught red-handed, the courts are stacked in their favor and they usually get off scott free no matter what they've done.
My father knew some police trainees in an academy in Chicago (Pretty sure, could be wrong) and these trainees said that police officers would carry around unlicensed weapons or bags of weed so they could plant evidence if they got in trouble.