Why does the UK have an above-zero drug-driving limit?
Love Island star Scotty T has been handed a driving ban after he was found to have exceeded drug driving limits. As we at MailOnline reported yesterday, he had 32 µg of cocaine and 800 µg of benzoylecgonine, a cocaine byproduct, in his blood when stopped by police - the limits are 10µg and 50µg respectively.
This prompted questions from our readers on why there are even drug-driving limits above zero - can you tell me why, for an explainer on drug-driving laws?

