The figures have been revealed by the Institute of Advanced Motorists (IAM) following a Freedom of Information request to every police force area in England and Wales, and come as the police forces launch their annual summer crackdown on drink and drug driving, with new drug-testing kits set to play a key role to detect cannabis and cocaine.
More than 400 people a month are being arrested for drug driving, with over 900 arrests having been made since the new drug-driving legislation came into force.