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On at least ten occasions the Crown has suddenly dropped the case against a motorist when ordered by a judge to hand over the telling footage.
Michael Morgan, who runs a British website collating complaints against laser speed guns, said: "The authorities often wriggle rather than release the video, which would expose the laser gun to scrutiny in a court of law.
Dr Clark says that the gun is defective because its wide beam can easily pick up the wrong vehicle.
Furthermore, if the device is not held firmly on the target - and this is a difficult task - it can produce an erroneous speed result by "slippage".
Rigorous tests We subjected the speed gun to rigorous tests.