Japanese "Orange Balls"

(Via BoingBoing)

Orange balls are the ubiquitous anti-crime tool in Japan used for stopping all sorts of criminals in their tracks, well almost… They are, orange balls, filled with a thick florescent ink that glows in the dark, and has a strong smell. Police dogs in Japan are actually trained to be able to track this particular odour (said to be similar to rotting pineapples), and are taught that it is the smell of a criminal.