A human rights group is charging police abuse accounts for some of the most serious human rights violations in the United States. New York-based Human Rights Watch investigated complaints in 14 major cities, including Minneapolis , and found persistant police brutality in all of them. The group also found people reporting brutality face enormous barriers in seeking punishment or prosecution of officers who have committed human rights violations. Minneapolis Police Chief Robert Olson says his department has made considerable progress in dealing with complaints, but it's not always possible to get rid of abusive cops.