Is it possible to represent interests in court and the police by power of attorney?

In most cases, individuals can be represented in court by lawyers and legal representatives. As for representation in the police, in most cases, the presence of a power of attorney will be sufficient.

The question you asked is quite extensive and has a lot of nuances, so if I have more details (jurisdiction of the court, questions you have for the police, etc..), I will be able to give a more precise answer.