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Laser device can detect alcohol in cars: External device detects presence of alcohol vapors inside of a moving car

An external laser device can detect the present of alcohol vapors in passing vehicles. The use of the device is simple: The laser system is set up on the side of the road to monitor each car that passes by. If alcohol vapors are detected in the car, a message with a photo of the car including its license plate is sent to a police officer waiting down the road. Then, the police officer stops the car and checks for signs of alcohol using conventional tests.
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