A recent study has revealed the frightening fact that more than a third of drivers who are under the influence of drugs are able to pass current road side sobriety tests.
Police were unable to spot the effects of drugs in around 36 per cent of people who later tested positive. The traditional pupil check, examining whether a pupil is constricted or dilated proved especially unreliable as around half of the drivers who tested positive for drugs showed no evidence in their pupils.
The Romberg Test, which assesses the ability to estimate the passage of 30 seconds, was found to be poor in identifying drug users. More than half of the drug positive drivers did not display clues and when the test was made more difficult by adding another task many drug free drivers failed and were taken into custody mistakenly.
In addition, Police are worried that many who would be unwilling to drink and drive for fear of being caught are prepared to take drugs as they think they can get away with it.
Road safety and motor insurance groups have now called on the government to upgrade police equipment to include road side drug tests used in some parts of Europe.
"There has been a sharp increase in the number of young drivers killed on our roads, and we suspect drug-driving may play a large part in this," said a spokesperson for the RAC.
"There is an urgent need to improve detection techniques and equipment available to our police."