Graffiti Tracker takes pictures of graffiti before it's painted over, using GPS cameras that record the date, time and exact location. The company analyzes the graffiti, for example checking whether it is gang-related, and stores the pictures in its database...
...Police use the information to track or predict where a particular tagger will strike next. Once perpetrators are caught, law enforcement has evidence to prosecute them for a string of offenses.
Tracking the tagger now!
Read the full story - 'Cities turn to GPS to wipe out graffiti'