>>1993584Police will lose whatever face they've still got if they don't actually enforce the "don't put paint on stuff without permission" laws on their own stuff, so of course that's a deterrent.
As for billboards, the issue there is that there's only one way on or off the billboard, compared to trains, where there's multiple directions you can go to get away from whatever you just painted. And it usually takes less effort to get rid of the graffiti too.
These guys don't get to keep doing it by getting caught. Unless they ask for permission first but well obviously a billboard company or police department isn't going to grant that.
