[ruined]

it backfires due to conflict of interest. the set of people responsible for enforcing such a system have always been the same set of people responsible for making the mistakes. it would take a duplication of the entire judicial infrastructure and division of policing power.

this essentially exists in the united states with the dual state and federal systems, but the local systems are extremely resilient against investigations, and the federal system has no interest in actually performing this role.

in rare cases there have been FBI investigations and federal oversight of entire departments, such as the Seattle consent decree, but there are many problems with such arrangements as covered by local journalists and activists. i'll see if i can dredge up some links later.