Immigration prefers it this way because it can essentially do anything it wishes to with foreigners when a situation is not clearly stipulated in law. In 1994, the Tokyo District Court ordered immigration to issue a visa to a Filipino woman who had Japanese kids from her marriage with a Japanese husband who had died. Immigration reluctantly issued a one-year visa to her after losing the court case. However, the law was never revised, and this issue continued to be treated as a policy matter, which left the woman without any legal protection of her status in Japan. The other reason why immigration does not want to change these policies into law is because laws are challengeable, but it is difficult to challenge policies.
Immigration likes policies because they are flexible, and can be changed as the bureau likes.
According to the media he allowed the former to land because his family was a fan of the star. This was too much, however, and Nakamura was forced to resign as Justice Minister in March 1999. Such actions are policies or in other words left to the capricious whims of Justice Ministry bureaucrats. People have seen the dark side of Japanese immigration. It is now time to change immigration policies into law.