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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.,And according to the type of police work, there are also a variety of allowances that can be received, such as patrol allowances for patrol officers and traffic management allowances for traffic police.。