In an effort to crack down on wily commuters who skirt the laws of England's multi-passenger-only lanes by placing mannequins in the shotgun seat or fixing photographs to the windshield, the British government is instituting new roadside cameras that detect the amount of blood and other bodily fluids in each car.

The enforcement devices send an infrared beam through the windshield of vehicles and measure the "unique make-up of blood and water content in human skin" to verify the appropriate number of passengers. Guess it's about time to start taking the family dog to work.

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