8 Things a Driver Must Know About Benzoylecgonine and Driving in 2026

Published by Drug Driving Solicitors, specialist defence lawyers for drug driving charges across England and Wales

Benzoylecgonine appearing on your blood test result usually points to one thing: you are probably facing a drug-driving allegation. Understandably, you will want to know what it means. As your body breaks down cocaine, it produces benzoylecgonine. Driving in England and Wales with too much of this substance in your blood counts as a criminal offence, even when you felt completely fine.

We go through what benzoylecgonine is, the legal limit, police testing, the penalties you could face and what you can do next.

1. What is benzoylecgonine (BZE)?

Benzoylecgonine (BZE) is the chemical your body produces when it breaks cocaine down, and it is known as the main metabolite of cocaine. BZE itself has no intoxicating effect. Finding it in your blood, however, is strong evidence that someone has used cocaine.

As BZE is so closely linked to cocaine, police include it among the substances they test for in drug-driving cases. Paperwork may use the name BZE, or refer to a cocaine metabolite.

2. Why can benzoylecgonine still be detected after cocaine's effects have gone?

BZE takes longer for the body to clear than cocaine, and so benzoylecgonine remains detectable after cocaine's effects have worn off. Many people feel completely sober while still having a measurable level.

The length of time depends on factors such as how much was taken, how often, and your individual metabolism. As for a reliable "safe" waiting time before driving, there is none.

3. Is having BZE in your blood while driving an offence?

Yes, so long as the level is above the legal limit. In England and Wales, anyone who drives, or attempts to drive, with a specified drug in their blood above its set limit commits an offence. You will find it in section 5A of the Road Traffic Act 1988, and the offence came into force on 2 March 2015.

Cocaine and benzoylecgonine each have their own entry in The Drug Driving (Specified Limits) (England and Wales) Regulations 2014, which lists the drugs covered and their limits. Consequently, a charge can follow either reading. Being "in charge" of a vehicle while over the limit (sitting in a parked car with the keys is an example) is a separate offence. It carries different penalties, and its endorsement is DG40.

4. What is the benzoylecgonine legal limit for drivers?

The benzoylecgonine legal limit is 50 micrograms per litre of blood (µg/L) for anyone driving in England and Wales. Cocaine itself has a lower limit still, at 10 µg/L.

Because the government took a zero-tolerance approach to illegal drugs such as cocaine, limits were set at a level that rules out accidental exposure and not at a level linked to impairment. Laboratory results are reported as "not less than" a figure, which accounts for measurement uncertainty. Never treat the limit as a "safe" amount, therefore: any recent cocaine use may take a driver over it.

5. Could you face a drug-driving conviction without being impaired?

Yes, you could. In a section 5A case, the prosecution only needs to prove that you were driving and that your blood level was above the specified limit. It is not necessary to show that your driving was affected.

In contrast, driving while unfit through drugs is a separate offence under section 4 of the Road Traffic Act 1988, which calls for evidence of impairment. Some drivers are investigated for both offences, so you should check which you face.

6. How do police test drivers for cocaine and BZE?

The police can perform a roadside preliminary drug test using a saliva swab. That test screens for cocaine and cannabis. A positive screen is not, on its own, enough to convict you, though it does allow the police to arrest you.

Then, at the police station, a doctor or healthcare professional takes a blood sample to be sent for laboratory analysis. Should you ask for part of the sample when it is taken, the law requires the sample to be divided and a part given to you, so that you can have it independently tested. Many drivers are released while they wait, since results can take weeks or even months.

Holding a charge or a blood result showing BZE? Drug Driving Solicitors can review your paperwork and set out the options open to you.

7. What are the penalties for a DG10 drug-driving offence?

In the magistrates' court, which hears these cases, a conviction carries a mandatory disqualification of at least 12 months, an unlimited fine and up to six months' imprisonment. If you have a conviction for a relevant drink-driving or drug-driving offence from the ten years before this one, the minimum ban increases to three years.

The conviction is recorded on your licence using the endorsement code DG10. That code stays on your driving record for 11 years from the date of conviction. Importantly, it is a criminal conviction and not just a motoring matter.

Much higher insurance premiums can follow, in practice, for years. For those who drive for work, the employer will be able to see the conviction on the licence.

8. Charged with drug driving: what are your options?

Obtain specialist advice before your first court hearing. Early decisions, including how you choose to plead, can affect the outcome. Whether the correct procedures were followed, how your blood sample was taken, stored and analysed, and whether the evidence that you were driving is sound are all points a solicitor may examine.

If you consumed drugs unknowingly, for example by way of a spiked drink, the court can take it into account when deciding the sentence. When a conviction is likely, strong mitigation may still influence how long the ban runs above the minimum, as well as the fine. Each case depends on its own facts, so nobody can guarantee a particular outcome.

Advice if you face a benzoylecgonine drug-driving charge

Benzoylecgonine can stay in your blood after cocaine has worn off, and a reading above the limit is enough for a charge, impaired or not. Serious penalties apply, but how your case is prepared may affect the outcome.

Speak to Drug Driving Solicitors if you have been charged or are waiting for blood test results, and we will give you clear advice on your situation.

Note that this article is general information about the law in England and Wales and not legal advice. Please seek advice on your own circumstances before acting.

Frequently asked questions

Am I still allowed to drive until my court hearing?

Usually, yes. A charge does not normally stop you driving, because the ban only begins once you are sentenced. Where the court convicts you but sentencing is delayed, it can impose an interim ban in the meantime.

Does a drug-driving conviction give you a criminal record?

Yes. Driving over the specified limit is a criminal offence and more than just an endorsement. Furthermore, the DG10 code stays on your driving record for 11 years from the date of conviction, and employers who check your licence are going to see it.

Can I get a drug-driving ban reduced through a course?

At present, you cannot. No national equivalent for drug driving exists to the drink-drive rehabilitation course, which can shorten some drink-driving bans.

Might I go to prison for driving over the BZE limit?

While prison is possible, it is uncommon. Under the Sentencing Council guideline, custody is the starting point only for the most serious category, for example where driving was commercial or with alcohol or another drug in the blood, combined with poor driving or obvious impairment. Finding cocaine and BZE together counts as one drug for this purpose.

Drug Driving Solicitors is a specialist law firm handling drug driving cases across England and Wales. If you have failed a roadside drug test and want to understand your position, call us for a free initial consultation or visit drugdrivingsolicitors.co.uk. Early advice costs nothing, and can make all the difference to the outcome of your case.