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Out of Japan's 220,000 police officers, only 500 are professional investigators. This comparison alone shows the difficulty of passing such an exam.,Apart from the aforementioned salary, if a police officer is unmarried, the Metropolitan Police Department requires them to reside in the designated single dormitory.,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.。