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detective , criminal counselor
Yes. The police.
Somehow, I don't think that's what you're looking for.
What's the problem, and how do you want it solving?
Go talk to a lawyer.
There's no point in putting cameras up if you can't use the evidence in court. Privacy laws are strict here.
Any damage (I guess by "ruf", you mean "roof") - declare it to the insurance company and the police. EVERY TIME it happens.