is this something pressing that must be reported right away? such as violence? then report it to shomrim/police as it make be classified as pikuach nefesh?
is it that you dont like him, and you think he stole from you then go to a rov, discuss your situation, and the rov will probably call him in, and give him a warning that he needs therapy and if he fails he will be reported.
WHen you as a rav, be wary, some rabonim will not let you report anything. Depending on the crime such as molesting, there are prominent rabonim, that will let you go straight to the police, as our Torah system, does not have a system that enables us to deal with it correctly in today’s day and age. We can give warnings but it does not help.
Similar to a battered woman, she knows she was beaten up so why stay with this guy?? because he says he loves her, and then buys flowers.. and then makes her feel she has no one else in the world but him….
Well molesters and criminals do that to rabonim, they say we did nothing wrong… we actually did them a favor, we watched the kid.. we were making sure the jewelry does not get taken by someone else, and they are full of excuses…..