Lasers have been looked at defeating CCTV cameras with a vareity of different reports on the results. One of the main reported problems is that laser are too directional, and as such if not pointed directly at the CCTV lens do not work.
Hence people have used an arrary of IR LED lights to resolves the direction issues.
One post report the used of a laser used to defeat CCTV that was activated by a mobile phone, the idea being that laser is fastened into position prior to it being activated - obvious that assumes that the laser and CCTV camera are both fixed and will not move.
