Research has suggested that many motorists think drink drivers are easier to catch than drug drivers.
The Confused.com poll of 2,000 people found that 37% of respondents thought those getting behind the wheel under the influence of drugs were less likely to be caught than drink drivers.
A quarter of men believed that drug driving had overtaken drink driving as a problem on Britain's roads - something which 18% of women agreed with.
When it came to drinking and driving, 34% of 45 to 54-year-olds said they had got behind the wheel after having a drink.
Road safety minister Mike Penning said: "We have taken urgent action and intend drug-screening devices to be available for use in police stations this year, making it easier for offenders to be brought to justice.
"In parallel, we are also investing in the development of equipment that could be used at the roadside, with studies into new technology under way."
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