A simple swab test, being used across the county from today, will help police to catch drivers who have been taking cannabis.
Normally, if officers suspect somebody of being under the influence, they have to use a ‘field impairment assessment’.
This involves looking at the driver’s eyes, and testing their balance and co-ordination.
If they fail any of the tests then police have to get a doctor to carry out a blood test, which provides them with evidence that they can use in court.
Getting a doctor can take several hours and in the meantime the driver – who might turn out to be innocent – has to be kept under arrest, taking up their time as well as the police’s.
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