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Roadside Laser Could Remotely Detect Drivers' Alcohol Breath

It's a bad idea to drink and drive. No rocket science there. But with the goal of reducing drunken driving, researchers have gone high-tech, creating a laser device that can detect alcohol vapor within a moving car, from alongside the road. After the laser is shone through a speeding vehicle, a mirror bounces it back to a detector that can sense small concentrations of alcohol.

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