Recently a robbery took place in the City where a photograph of the suspect was published via the media and a suspect arrested that same night. Of course the judicial system will have to determine if the right person was arrested, but the fact that one picture produced some immediate feedback from the public is truly amazing. I am often asked about the use of security cameras and here is a clear example of how well they can work. Many times the threat of being recorded is a deterrent; but if not a deterrent and the criminal still commits a crime it can be a huge tool in solving the crime.
The key however is to have extremely good equipment. Although I am not an expert in security systems I do have some basic ideas as to what works best. Digital versus tape recording is very superior in quality and allows for non blurred still prints to be captured. Also important is to have a color camera versus a black and white and given your use and needs maybe low lighting issues need to be addressed.
If you think you have a need to install or upgrade an exisiting video surveillance system do some research, find some reputable security firms and speak to more than one professional and go from there.