Japan culture

I'm surprised there's no criminal prosecution. Or should I add "yet"?

Well probably it is a high or semi high ranking officer

Tradionally he will resign take the public blame and get a good "pension-job" somewhere to rake in a lot of money.

Police is never wrong in Japan. Once you are arrested you are convicted. This is how they keep their "solved and convicted criminal cases number" so high.

If the crime is too difficult to solve then they will just let the paperwork disappear and thus it is not taken into the statistics.