Out of Japan's 220,000 police officers, only 500 are professional investigators. This comparison alone shows the difficulty of passing such an exam.,Perhaps it's because the dowry of grandmothers in this world includes a hereditary hot spring that can't be taken away,That is to say, as long as you don't spend extravagantly, by the age of thirty, a police officer's savings should be at least 1.5 million if not 20 million.。