Satellites can pinpoint the location of graffiti taggers fast enough to catch them in the act. TaggerTrap is being tested in several California cities and uses cell phones and special sensors that recognize the ultrasonic hiss of spray cans. “The tagger, when he pushes down on that spray can, he’s calling police,” says George Lerg, of TrapTec. Then GPS finds the tagger’s location and the cops pick him up.
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