An 18-year-old who wanted to test out his friend’s moped was caught drug-driving by police. John Darby, of Daisy Lane in Downham, appeared at Lynn Magistrates’ Court on Thursday, where he admitted driving above the specified drug limit as well as driving without the correct insurance. On November 18 last year at midnight, police were on patrol in the Downham area when they stopped a moped driving on the McDonald’s car park. Officers made checks which confirmed that Darby was not insured to drive the vehicle. They also asked him to complete a drug swipe which returned a positive result for cann…