In USA*

Many other countries have proper multi-year colleges specifically for the field of policing, and rigorous physical and mental health tests required to get the job. In those countries the police is more educated and more competent than the vast majority of the population.

I can't think of any country with a competent police force.

The problem is that in most countries (except the US), it is an extremely badly paid job, so it only attracts people who get something else from it: power.