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Lasers are a nightmare to use properly. Even when they are they are *too* accurate and generate some odd results. For example, you could airm the laser and have it hit the top windscreen surround and then (as the car is moving and you're trying to track it) the laser points at the front grill. The laser picks up the change in distnace and factors that into the speed calculations.
Many cases where speeding have been based on laser evidence has been thrown out. For example, the first case the defending lawer picked up the unit and aimed it at a wall and it read "5mph". In the UK whole police forces have been told to stop using them pending a "review and training" as they are getting wacky results.
With the elise the car has quite a few swoops and grills not like the normal everyday car. this causes the laser to be confused as it will see the reading jump around errectically and the modern ones need several consistent readings before they register a speed (To take account of the problems above). This is why lasers almost always have to be used a long straight stretches of road with good visibility - trying to track a car with any movement other than straight towards you is incredibly difficult.
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