Drug-driving in England, Scotland and Wales could become a specific offence with a jail term and fine, under a new law expected in the Queen's Speech.
Police have to show driving has been impaired by drugs to prosecute.
But under the plans, drivers could face up to six months in jail for driving with certain controlled drugs in your body in excess of specified limits.
Road Safety Minister Mike Penning said legislation would give police powers to "remove this blight".
In the future, police will be equipped with handheld detection devices to test saliva at the roadside.
Offenders could face a fine of up to £5,000, a driving ban of at least 12 months as well as a prison term.
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