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Road Safety Bill [Lords]

I commend the intentions behind the new clause. As a practising criminal solicitor for a number of years, I know the problems that prosecutors face in seeking to mount a successful prosecution of someone charged with driving while unfit through the use of drugs. In particular, properly proving that someone has cannabis in their system, and that it makes them unfit to drive, is a real issue. I know that those who have successfully defended such cases have been sympathetic to the problems faced by the prosecution. When someone has traces of cannabis in their body, it is often difficult to determine whether that is because they passively smoked it as a passenger in a car in which it was being smoked, or whether they were actively smoking it.