Police today launched the annual Christmas crackdown on drunk or drug-impaired drivers.Officers said extra checks would be made on drivers across the city and county and around the clock in the run-up to Christmas and New Year's Eve.Last year's month-long operation was the first to see officers using roadside testing kits which enable them to identify motorists who are under the influence of drugs.The handheld devices, which are part of officers' everyday kit, can detect the merest trace of...
