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It recognizes the driver's facial expressions, alerts the driver and sends events to specialists at a monitoring center. The December 2019 report found that participants almost unanimously believed that the technology would profoundly reduce fatigue and distraction events. Most operators reported that incidents fell after they adopted it. For most operators, distraction made up about 80% of reported alerts, and most of the perceived benefit came from curbing phone use and other distraction. The researchers wrote that clear technical evidence of the technology's validity and reliability was still lacking. Only one supplier could provide even basic validation data, and no operator compared drivers with and without the technology. 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