Out of Japan's 220,000 police officers, only 500 are professional investigators. This comparison alone shows the difficulty of passing such an exam.,After that, with the support of his family and the prize money, he successfully graduated from the Faculty of Law at Tokyo University. Afterwards, he passed the Class 1 Examination and became a professional elite.,As for the criminal police, there are even more benefits. If you're on duty at night to investigate a crime scene, you'll get both an emergency call stipend and a night shift special operation allowance.。