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1. In Japan, police officers sometimes visit schools to educate students on safety and security, but it is not common to have police officers stationed at schools full-time.

2. Schools in some countries have police officers as a measure of security to help prevent crime and ensure the safety of students and staff. However, the use of law enforcement officers in schools varies widely between countries and regions.

3. The question of whether or not having police officers in schools is a good idea is a topic of debate. Some argue that it helps deter crime and promote safety, while others argue that it creates a tense environment and leads to the disproportionate discipline and arrests of students, particularly those from marginalized communities. Ultimately, the decision to have police officers in schools should be made based on a careful consideration of the potential benefits and drawbacks in each specific context.