Don’t worry, in the US there is no lack of law enforcement agencies to spy on each other and fill our for-profit prisons. In most states, if not all, there is a state police organization fashioned after the FBI whose duty it is, among many others, to investigate city and county police departments which show signs of corruption. They usually answer straight to the State Atty’s office, or in some states, the Lt. Governor. In Florida the agency is called the Florida Dept. of Law Enforcement. Georgia has the Georgia Bureau of Investigation, Tennesse has the TBI.
The city/county agencies are watched by the state agencies, the state agencies are watched by the FBI, the FBI is watched by other agencies withing the Dept. of Justice, and the National Security Agency is sometimes used to watch any and all. The CIA, who under the Patriot Act can and do now operate domestically, has been known to rat out the FBI and vice versa. Then there is the Secret Service from the Treasury Dept., the law enforcement arm of the Dept. of the Interior, Homeland Security which has become a huge umbrella for old and new police organizations, the US Marshalls, ad infinitum – all of which can be assigned to investigate other agencies if necessary. They are all supposed to be bound by their own charters and by the Constitution to do their jobs properly and not get off the leash, but whether or not they actually do well to contol corruption everywhere or even within their own agencies, well, that is a source of many an argument. I’ve lived in worse places. We’re better of than Mexico and Columbia, but not as clean as Sweden.
We now have more cops per capita than any other country in the world. We also have more people per capita incarcerated than anywhere else. That includes huge communist “police states” like China and dirtbag backwater dictatorships like Mayanmar..