Hello! It is correct that it is not prohibited by law and by-laws, it is allowed. Officially calling for a duel is prohibited, but with what and when? Try to find, you will not find. And kill in an honest duel, even with notarized documents, an amba will come to you. The analogue of the law and so on will come into force. And the law will take retroactive effect. You and the detectives are yours to make it illegal to do the law, but how, it depends on the experience and ingenuity of everyone. There are of course things that no one will ever do. For example, penetration into someone else’s apartment and that, with some preparation and insurance, can be done. Here are just the neighbors and how to deal with them. Jammers blocking mobile and other communications. Very expensive event and dangerous. But if the client pays and guarantees ... Listening to the cell phone is also prohibited by law, but we do it anyway. By the way: from 2000 to 2008, the newspaper Top Secret article was about how wiretapping is carried out in the Russian Federation by ordinary people. Igor from Latvia