Re: writers in action!
Cameras and motion sensors, are probably more effective than aerosol detectors, yet fucking loads of places in london have them that get painted,
They get smashed off, and usually not replaced for ages, or if they keep getting smashed off then they give up and dont bother fixing them
Im sure a system would have to be abolutley battterd before they install graffiti specific security measures, cams and sensors are usually to stop thieves tramps and terrorists and just happen to come in handy for writers.