The US has lots of different police forces – city police, county police, state police. Many other countries have more centralised policing with fewer levels. I think, a smaller number of bigger police forces might promote more professionalism, more professional management, oversight by more experienced politicians (state political leaders tend to be more experienced and capable than local political leaders, especiall…
The problem is that there is no organization that is incentivized to uncover or investigate police crimes. All other portions of government have cross-checks to stop people breaking the law. The police don't, and cover for one another. There needs to be an organization that has clear and direct incentive to prosecute abuses by the police, that doesn't have a century+ long tradition of violence, selective enforcement,…
(Also, separately from the LECC, there is also an Inspector of the LECC, whose job is to investigate misconduct by the LECC themselves.)