8 Things Worth Understanding About Benzoylecgonine and Driving in 2026

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

Most people who find benzoylecgonine mentioned in their blood test result are probably facing a drug-driving allegation, and they want to know what the result means. In short, it is a substance your body makes in the course of breaking down cocaine. England and Wales treat driving with too much of it in your blood as a criminal offence, even if you felt completely fine.

Below, we cover what benzoylecgonine is, the legal limit, the testing carried out by police, the penalties you could face and what you can do next.

1. Benzoylecgonine: the basics

Known as the main metabolite of cocaine, benzoylecgonine (BZE) is the chemical produced by your body when it breaks cocaine down. It brings about no intoxicating effect on its own. Even so, finding it in a person's blood is strong evidence that cocaine has been used.

Police test for BZE in drug-driving cases since it is so closely linked to cocaine. It can appear on paperwork as BZE or as a cocaine metabolite.

2. Benzoylecgonine after cocaine wears off: why it can still be found

Benzoylecgonine is detectable after the effects of cocaine have worn off because your body clears BZE more slowly than cocaine itself. You can therefore feel completely sober but still have a measurable level.

How long it remains will depend on factors such as how much was taken, how often and your individual metabolism. A reliable "safe" waiting time before driving is not available.

3. Is it illegal to drive with BZE in your blood?

That depends on whether the level is over the legal limit: if it is, the answer is yes. In England and Wales, it is an offence to drive, or attempt to drive, while having a specified drug in your blood above its set limit. The offence sits in section 5A of the Road Traffic Act 1988 and has applied since it came into force on 2 March 2015.

The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 list the drugs covered, along with their limits. Cocaine and benzoylecgonine appear separately in that list, and either reading can therefore lead to a charge. Being "in charge" of a vehicle while over the limit, such as when sitting in a parked car with the keys, is treated as a separate offence. Its endorsement is DG40, and it has different penalties.

4. The benzoylecgonine legal limit for driving

Across England and Wales, drivers must not exceed the benzoylecgonine legal limit of 50 micrograms per litre of blood (µg/L). The limit is lower for cocaine itself, at 10 µg/L.

With illegal drugs such as cocaine, the government chose a zero-tolerance approach. The limits it set are at a level that rules out accidental exposure, not a level linked to impairment. Laboratory results are reported as "not less than" a figure, which allows for measurement uncertainty. The limit should therefore never be regarded as a "safe" amount, as any recent cocaine use may push a driver over it.

5. Drug driving without impairment: is conviction possible?

Yes. For the section 5A offence, it is enough for the prosecution to prove that you were driving and that your blood level was above the specified limit. It does not need to show that your driving was affected in any way.

The separate offence of driving while unfit through drugs, under section 4 of the Road Traffic Act 1988, is different in that it requires evidence of impairment. Some drivers are investigated for both offences, so check which one you are facing.

6. How the police test for cocaine and BZE in drivers

Police are able to carry out a roadside preliminary drug test, which uses a saliva swab and screens for cocaine and cannabis. A positive screen gives the police the power to arrest you, but it cannot convict you by itself.

At the police station, a blood sample will be taken by a doctor or healthcare professional and sent for laboratory analysis. Asking for part of the sample at the moment it is taken means the law requires it to be split, and a part must be handed to you for independent testing. Results may take weeks or even months, which explains why many drivers are released to wait for the result.

If a charge or a BZE blood result has arrived, Drug Driving Solicitors can review your paperwork and explain what your options are.

7. The penalties for a DG10 drug-driving conviction, explained

These cases are heard in the magistrates' court, where a conviction means a mandatory disqualification of at least 12 months, an unlimited fine and up to six months' imprisonment. If you were convicted of a relevant drink-driving or drug-driving offence during the ten years before this one, the minimum ban rises to three years.

The conviction will be recorded on your licence under the endorsement code DG10, which stays on your driving record for 11 years from the date of conviction. It is not just a motoring matter, because it is a criminal conviction too.

This can result in much higher insurance premiums for years in practice. If you drive for work, your employer will be able to see the conviction on your licence as well.

8. If you have been charged, what can you do?

You should get specialist advice before your first court hearing, since early decisions, including your plea, can affect the outcome. Your solicitor may examine whether proper procedures were followed, how your blood sample was taken, stored and analysed, and whether the evidence that you were driving is sound.

Should drugs have been consumed unknowingly, for example through a spiked drink, the court can take this into account in deciding the sentence. Strong mitigation may still influence both the fine and the length of the ban above the minimum, even when a conviction is likely. Every case depends on its own facts, so it is impossible to guarantee any particular outcome.

Advice on a benzoylecgonine drug-driving charge for you

Benzoylecgonine can stay in your blood after cocaine has worn off. Whether or not you felt impaired, a reading over the limit is enough for a charge. The penalties are serious, but how your case is prepared may make a difference to the outcome.

Speak to Drug Driving Solicitors for clear advice on your situation, whether you are waiting for blood test results or have already been charged.

This article provides general information about the law in England and Wales and is not intended as legal advice. Please take advice that is specific to your own circumstances.

FAQs about benzoylecgonine and driving

Can I go on driving before my court hearing?

Generally, you can. A ban starts when you are sentenced, meaning a charge does not usually stop you driving. If the court convicts you but delays sentencing, it is able to impose an interim ban in the meantime.

Do I get a criminal record from a drug-driving conviction?

Yes, you do. It is a criminal offence to drive above the specified limit, which makes it more than merely an endorsement. The DG10 code also stays on your driving record for 11 years from the date of conviction, which means employers who check your licence will see it.

Will taking a course reduce my drug-driving ban?

Not at present. For drug driving, there is no national equivalent of the drink-drive rehabilitation course, even though that course can shorten some drink-driving bans.

Will I be sent to prison for driving over the BZE limit?

Imprisonment is possible but uncommon. The Sentencing Council guideline treats custody as the starting point only in the most serious category, for example driving commercially or with alcohol or another drug in the blood, combined with poor driving or obvious impairment. Cocaine and BZE found together count as just 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.