How do police test for drug driving?

How do police test for drug driving?

17/11/2025

Drug driving is a serious offence in the UK. Potential penalties include a driving ban, hefty fine, and even a prison sentence.

This article explains how the process for drug testing works, and what rights you have if you are pulled over.

Testing at the roadside

In the UK, testing for drug driving at the roadside often involves Drugwipe. This is a quick and reliable drug testing kit used by police. It checks for recreational drugs such as cannabis and cocaine; producing reliable results in minutes.

Police will carry out a roadside test if they suspect that a driver has taken drugs. They may have been alerted to this possibility by delayed reactions or sudden swerving.

A field impairment test may also be carried out at the roadside. This involves asking the driver to perform tasks such as walking in a straight line or balancing on one leg, and is intended to demonstrate focus and coordination.

For cases in which the test is positive – or if the officer still has concerns – the driver can be arrested and taken to the police station for further testing.

Testing at the police station

At the station, drivers suspected of drug driving will usually be asked to provide a blood or urine sample. The samples are then analysed in a laboratory to identify both illegal drugs and prescription or over-the-counter medications that could impair driving.

Exceeding the specific legal limit of a substance – even slightly – may lead to prosecution.

Results may take a few days or weeks to be produced. During this period, it’s important that drivers obtain professional legal advice. Any mistakes in procedure or sample handling could affect the validity of the evidence against you.

Protecting your rights

If you are involved in a drug driving course, make sure you are getting the right advice from the right experts.

Drug driving cases can be complex, and so it’s important to seek advice from dangerous driving solicitors who are highly experienced in this area of law. Gaining cost-effective legal support will empower you to represent yourself confidently in court while benefiting from expert guidance every step of the way.