[jltsiren]

The way it works in Finland:

Police officers are public officials. As such, they do not have the right to have a second job or a side business by default. They may apply for a permit for a specific job, and it is usually approved if there are no obvious conflicts of interest or other reasons that could compromise their impartiality. Some jobs, such as private security, are automatically out of question.

If your event needs security, you hire private security. Police officers may have been involved in training the security personnel, but they can't work in the field. And if a uniformed police officer shows up at the event, it almost always means something has gone wrong.