ONE PER CENT

摘要

Graffiti artists, beware. Trainsin Sydney, Australia, can now smell when you are up to no good. An undisclosed number have been fitted with electronic chemical sensors that can detect the vapours emitted by spray paint and permanent markers. When the sensors pick up a suspicious smell, live CCTV in the train sends images directly to security staff. So far, more than 30 people have been apprehended, say police.