Police officer in a high-visibility jacket speaking to a driver beside a car

Drug Testing FAQs

Can police randomly drug test drivers in the UK?

Not without legal grounds. Police can stop vehicles for routine checks, but that does not automatically allow a random drug test. Roadside testing powers depend on circumstances and differ between Great Britain and Northern Ireland.

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When can police require a roadside drug test?

In England, Wales and Scotland, grounds include reasonable suspicion of drug use, a moving traffic offence, or involvement in a road collision. Officers do not always need evidence of impaired driving.

Northern Ireland has separate legislation, with similar grounds for preliminary tests. Police there also use roadside saliva screens, but the drug-driving offences and evidential requirements differ.

What happens after roadside screening?

Roadside saliva devices screen for particular drugs, commonly cannabis and cocaine. A positive screen may lead to further tests; it is not the final evidential result.

Police may require a blood sample for laboratory analysis. A negative roadside screen does not end the investigation if officers still suspect impairment. Northern Ireland’s current offence focuses on unfitness through drugs.

Can I refuse or use a home test instead?

Refusing a lawfully required preliminary test without a reasonable excuse can be a criminal offence. Ask a solicitor for advice about a testing requirement or a charge.

A negative home drug test cannot prove fitness to drive or compliance with legal limits. Personal kits can use different panels, sample types and cut-offs and cannot replace police screening or evidential testing.

Buying a kit for personal screening?

Check what the test can tell you.

Compare the substances covered before choosing a Rezure kit. Home tests provide screening information and cannot tell you that you are safe or legally permitted to drive. Ask a solicitor about police testing or a specific case.

Need help checking what a particular Rezure kit screens for? Contact our team with the kit name for product information and instructions.