Brilliant! I too am a police officer and would advice EVERYONE to report any incidents. If officers know that this sort of thing is going on and they are having a quiet eve/night they can sit up and watch things discretely you know. How else will these people be caught. Once someone is arrested for this type of thing the Crime Reports are checked for similar MOs and these cases can be put to these peopel too. It really is worth it. NEVER argue the case either - a phone is a phone, just hand it over, I've dealt with too many stabbings recently, it's just not worth it.
