Figures uncovered by the Daily Mail show that Police forces using the new roadside ‘drugalyser’ are recording positive results for up to 56 per cent of motorists tested.
By comparison, just 5 per cent of motorists breathalysed for drink-driving last year failed.
Transport Secretary Patrick McLoughlin said the findings confirmed the push to make drug-driving as socially unacceptable as drink-driving.
The new law came in on March 2 sets permissible limits at very low levels for eight illegal drugs such as cannabis, cocaine and ecstasy.
Roadside testing kits can currently detect cannabis or cocaine in the saliva with laboratory testing available for other banned substances.
The results shown that South Yorkshire produced the highest amount of positive results with 48 out of 85. Next is London’s Metropolitan Police where 75 out of 168 tests were positive.
Warwickshire and West Mercia reported 28 out of 67, while Dorset Police reported 8 positive readings out of 19.
Sussex Police announced 61 people arrested for drug driving, Merseyside made 24 drug-drive arrests and Kent Police reported 7 arrests.