CCTV is usually the first request in police enquires, it allows you to identify a potential suspect or victim. Without CCTV identification of a suspect it can be very difficult, it also deters crime as people fear of being caught. It can make a small but statistically significant reduction in crime - it is most effective when directed at reducing theft and/or from vehicles. It is least effective when it comes to violent crimes. Many cases have been solved due to CCTV, for example to James Bulger case.