AUSTRALIA: Sydney Trains is testing Mousetrap, an electronic sensor which can detect vapour from... More...
They do a good job cleaning up after the vandals in Sydney. I was impressed by how clean the cars were. I did notice some windows where the glass was scratched with graffiti tags. That would be a hard one to detect.
Excellent. They should make the slimeballs pay cleanup and sensor costs, do the cleanup work, plus spend time in jail.