The Ineffectiveness of Security Cameras

"The only positive deterrent effect was the reduction of larcenies within 100 feet of the cameras. No other crimes were affected -- except for homicides, which had an interesting pattern.

Murders went down within 250 feet of the cameras, but the reduction was completely offset by an increase 250 to 500 feet away, suggesting people moved down the block before killing each other."

http://www.schneier.com/blog/archives/2008/04/the_ineffective.html

"This quote is instructive:

Mayor Gavin Newsom called the report "conclusively inconclusive" on Thursday but said he still wants to install more cameras around the city because they make residents feel safer.

That's right: the cameras aren't about security, they're about security theater."