Tribal police Sgt. Dawn White is racing down a dusty two-lane road — siren blaring, police radio crackling — as she attempts to get to the latest 911 call on a reservation that is a blur of oil rigs and bright-orange gas flares. “Move! C’mon, get out of the fricking way!” White yells as she hits 102 mph and weaves in and out of a line of slow-moving tractor-trailers that stretches for miles. But there is a dark side to the multibillion-dollar boom in the oil fields, which stretch across western North Dakota into Montana and part of Canada. The arrival of highly paid oil workers living in sprawling “man camps” with limited spending opportunities has led to a crime wave — including murders, aggravated assaults, rapes, human trafficking and robberies — fueled by a huge market for illegal drugs, primarily heroin and methamphetamine.