Driver failed drug test tells court he 'had never knowingly' taken cocaine | Updated: 16:38, 05 March 2021 A driver who was marginally over the limit for cocaine said he had never knowingly taken the drug. Michael Cook, 43, had an accident on the A47 at Emneth when his Vauxhall Combo van collided with a Scania lorry, causing its fuel tank to burst. It happened at about 8.40am on June 2, 2020. King's Lynn Magistrates' Court (44894131) Cook failed roadside drug wipe and a test in custody showed 11 micrograms per litre of blood in his system. The legal limit is ten. At Kingâs Lynn Magistratesâ Court on Thursday, he pleaded guilty to drug-driving. The court was told he had an excess alcohol conviction within the past ten years, which would trigger a mandatory minimum three-year ban.