When you are accused of a motoring offence, the evidence presented by the prosecution—from speed camera photographs and police statements to breathalyser readings—can seem overwhelming and scientifically unbeatable. It is a common feeling to believe that the case is an open-and-shut matter and that there is little point in fighting. However, a successful legal defence is rarely about a single "magic bullet" argument; it is a methodical process of investigation, forensic analysis,...