All you have to argue is when was the speedo of the car last calibrated. Its a very short period of time actually and often are out of calibration. You could say that tyre wear, tyre pressure could affect the reading of the speedo andthey will probably judge in your favour.
If the radar gun has a calibration date older than one year from the data of the offense, you can argue that the reading could be in-correct.
Police also have to be in full uniform (hat included) and must be wearing a yellow vest when stepping out of the car, otherwise the are breaking their OH&S and that is another foot you can stand on.
There are many loopholes that you can use, but its a matter of sitting down and writing a letter, which I need to do this week.
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