FRESNO, Calif.— “The thieves strike in the middle of the night and work fast, in pairs or teams. They can make an entire neighborhood go dark in minutes. They screw open the street light maintenance boxes, find the copper wires and cut. Zip, zip. While police nab copper thieves in the act, they can’t be everywhere. Come nighttime, some streets are as black as caves. Even if thieves stopped today, utility crews would need up to a year to fix all the damage. Meanwhile, darkened neighborhoods entice crooks bent on robbing houses, stealing cars or worse.