The Police are rarely asked to give evidence in cases when a speeding prosecution is brought and therefore rarely asked to prove they have operated a device properly. The officer may not have been challenged previously, and may have difficulty in demonstrating an understanding of the various checks to perform on the equipment .
Where a speeding prosecution is based on the opinion of an eye-witnesses that a vehicle was speeding, even if the witness is a police officer, if this is the only evidence, and no speed recording device was used, there must be at least two witnesses who say that the vehicle was speeding.
Police mistakes
