I installed a camera system on a house and placed signs at several locations alerting others to the presence of cameras. Well, yesterday a burglar broke-into the house next door. They moved two of my cameras so they would not be seen carrying goods into a shared alley. I got video of them moving the cameras so it partly worked against them as evidence. To prevent future tampering I am going to put protective housing around some of the cameras.
However, this also brings up the issue of whether I should keep the surveillance warning signs up, or take them down? There are also signs about the presence of a monitored security system, so maybe that is enough.