Laws to target drivers on drugs

New laws to clamp down on drug-driving may be rushed out this autumn.

Ministers also plan to introduce roadside devices to test motorists for drugs within two years.

The tests, which manufacturers describe as similar to breathalysers, follow research suggesting half of all road deaths involve drivers who are high on cannabis, heroin, cocaine or other drugs.

There are no specific laws against drug-driving and action to curb the menace has been hampered by the failure to develop quick, reliable tests.

Police now examine suspects at the roadside using "field impairment tests" such as checking their pupils and making them stand on one leg.

Blood or urine samples can be taken at police stations but results take weeks and offenders cannot be prosecuted if they refuse to provide a sample.

The new laws follow concern that the problem will escalate with the downgrading of cannabis and increasing social acceptance of the drug for recreational use.

Experts believe many younger drivers have no qualms about driving after taking ecstasy or smoking a joint, even though they regard drink-driving as unacceptable. A marijuana joint can impair driving as much as five pints of beer.

The new test will use saliva swabs to detect the presence of drugs within around 10 minutes. New laws are likely to command all-party support.