I recall a paper at SEAC a few years ago where a park ranger who was having trouble with vandalism on a site simply posted signs saying that the place was under video surveillance.  Of course this was not true but the public did not know and the incidents decreased.

He reported it to be very successful. 

dh


________________________________________________________________________
Try Juno Platinum for Free! Then, only $9.95/month!
Unlimited Internet Access with 1GB of Email Storage.
Visit http://www.juno.com/value to sign up today!