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"They've never had the police coverage they've had in the last three years," Troise says, referring to the period of time McCarthy has been patrolling the buildings. He says robberies in the precinct are down 21 percent this year over last.

McCarthy says neighborhood thugs know when to strike, so it becomes a game in which he and the thugs are trying to outwit one another.

"The criminals study my pattern," he says. "They know when I'm not here."