LAPD's sci-fi solution to real crime

Sergeant John Gomperz slows his black-and-white patrol vehicle to a crawl as he enters the parking lot of one of the shopping malls that litter the Los Angeles northern suburbs. For the next 15 minutes, he drives up and down, past McDonald's, Taco Bell, and a row of fast-food outlets. Then he pauses at the entrance of the electronics store Best Buy, and scans the horizon.