A police campaign to target drug drivers caught more than 900 motorists who were under the influence of illegal drugs last month.
The Christmas campaign used new powers and roadside testing kits to launch a crackdown on drivers who take to the wheel after using cannabis, cocaine and other substances.
Officers used 1,888 drug screening devices during December with 931 showing positive results for drugs - or almost 50 per cent.
New legislation, which covers 17 legal and illegal drugs, and the roll-out of drug detection devices to all forces has made it easier to identify and prosecute drug drivers, the NPCC said.
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