[factotum]

That's an nearly impossible metric to pin down. You'd have to ask criminals who would have done something in specific instances whether the cameras dissuaded them from doing it. Good luck with that.

What I can tell you is our cameras have assisted both us and police (via my consent) to identify a group of individuals who were breaking into cars in our neighborhood. Word will eventually get around that my neighborhood has cameras and people who are watching. That's a powerful deterrent.