I'm thinking about making a complaint to the police about somebody. The police said they will create a file on him just in case something happens later (that he murders me, for example), but they won't be taking any action at this stage, apart from having a chat with him, as it's not serious enough and there's a lack of proof. I'm worried that the information I provide could get into his hands, by his lawyer, for example. How safe will the information be if I provide it?