yes, people tend to act differently. not the people they're trying to afect, just random people just minding their business. but it is not an effective deterrent to things like "violent crime".

• Meta-analyses (studies that average the results of multiple studies) in the UK show that video surveillance has no statistically significant impact on crime.

• Preliminary studies on video surveillance systems in the US show little to no positive impact on crime.

https://www.aclu.org/sites/default/files/images/asset_upload...

I thought he asked for evidence?