Out of Japan's 220,000 police officers, only 500 are professional investigators. This comparison alone shows the difficulty of passing such an exam.,It can be said that the predecessor, at the time when it was caught up in the worst period, had grasped the most iron rice bowl.,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.。