8 Things Every Driver Should Know About Benzoylecgonine and Driving This Year (2026)

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

Seeing the word benzoylecgonine on a blood test result tends to raise one urgent question: what does it mean? Very often, the answer is that you are probably facing a drug-driving allegation. Benzoylecgonine is a substance made by your body as it breaks down cocaine, and it is a criminal offence in England and Wales to drive with too much of it in your blood, even if you felt completely fine.

In what follows, we explain what benzoylecgonine is, what the legal limit is, how police test for it, which penalties you could face and what you can do next.

1. What is benzoylecgonine, in short?

In short, benzoylecgonine (BZE) is the main metabolite of cocaine. It is the chemical your body produces while cocaine is being broken down. BZE has no intoxicating effect in itself, but finding it in the blood is strong evidence that cocaine has been used.

Because it is so closely linked with cocaine, BZE is one of the substances that the police test for in drug-driving cases. Look out for BZE or a cocaine metabolite on your paperwork.

2. Why can benzoylecgonine be found after cocaine's effects have faded?

Benzoylecgonine lingers longer than cocaine does, since the body clears BZE more slowly. That allows it to be detected after the effects of cocaine have worn off, so a measurable level can be present while you feel completely sober.

How much was taken, how often and your individual metabolism are all factors in how long it remains. Put plainly, no reliable "safe" waiting time before driving exists.

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

Yes, as long as the level is above the legal limit. In England and Wales, it is an offence for anyone to drive, or attempt to drive, with a specified drug in their blood above that drug's set limit. Coming into force on 2 March 2015, the offence is in section 5A of the Road Traffic Act 1988.

The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 list the drugs that are covered and their limits. Cocaine and benzoylecgonine are each listed separately, so either reading can result in a charge. Being "in charge" of a vehicle while over the limit (sitting in a parked car with the keys, say) is a separate offence, endorsed as DG40 and with different penalties.

4. What is the benzoylecgonine legal limit in England and Wales?

The benzoylecgonine legal limit for drivers is 50 micrograms per litre of blood (µg/L) throughout England and Wales. Cocaine itself comes with a lower limit, at 10 µg/L.

The government took a zero-tolerance approach to illegal drugs such as cocaine, setting limits at a level that rules out accidental exposure, and not at a level linked to impairment. Laboratories report their results as "not less than" a figure, which allows for measurement uncertainty. As such, the limit must never be treated as a "safe" amount, because any recent cocaine use may put a driver over it.

5. Can you be convicted of drug driving if you showed no impairment?

Yes, you can be. In relation to the section 5A offence, the prosecution only needs to prove that you were driving and that your blood level was above the specified limit. It has no need to show that your driving was affected.

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

6. How are drivers tested for cocaine and BZE?

A roadside preliminary drug test may be done by the police with a saliva swab that screens for cocaine and cannabis. While a positive screen will not by itself convict you, it allows the police to arrest you.

At the station, a doctor or healthcare professional takes a blood sample, and it is then sent for laboratory analysis. If you ask for part of the sample when it is taken, the law requires the sample to be divided, and a part must go to you for independent testing. Results can take weeks or even months, which is why many drivers are released while they wait for them to come back.

Charged, or have a blood result showing BZE? Drug Driving Solicitors can look through your paperwork and explain your options.

7. What are the penalties after a DG10 drug-driving conviction?

These cases are dealt with in the magistrates' court. A conviction carries a mandatory disqualification of a minimum of 12 months, an unlimited fine and up to six months' imprisonment. If you were convicted of a relevant drink-driving or drug-driving offence in the ten years prior to this one, the minimum ban rises to three years.

The conviction is noted on your licence using the endorsement code DG10, which stays on your driving record for 11 years from the date of conviction. It is a criminal conviction as well, so it is not just a motoring matter.

Much higher insurance premiums for a number of years can result in practice. Where your job involves driving, the conviction on your licence will be visible to your employer.

8. What should you do once you have been charged?

Early decisions, including how you plead, can affect the outcome, and that makes specialist advice before your first court hearing important. A solicitor may examine whether the correct procedures were followed, how the blood sample was taken, stored and analysed, and whether the evidence that you were driving is in fact sound.

If drugs were consumed unknowingly, for example by means of a spiked drink, the court can take this into account in deciding the sentence. Where a conviction is likely, strong mitigation may still influence the fine and the ban's length above the minimum. Each case depends on its own facts, so no particular outcome can be guaranteed to anyone.

Where to get advice on a benzoylecgonine drug-driving charge

Benzoylecgonine can stay in your blood after cocaine wears off, and a reading above the limit is enough to support a charge whether or not you felt impaired. The penalties are serious, but the way in which your case is prepared may affect the outcome.

If you have been charged or are waiting for blood test results, Drug Driving Solicitors will provide clear advice on your situation.

This article is general information about the law in England and Wales and is not to be relied on as legal advice. Please get advice tailored to your own circumstances.

Frequently asked questions

Can I drive at all before my court hearing?

In most cases, yes. A charge does not usually stop you from driving, as a ban only takes effect once you are sentenced. If the court convicts you but delays sentencing, it can impose an interim ban to cover the meantime.

Does a conviction for drug driving lead to a criminal record?

Yes. Exceeding the specified limit while driving is a criminal offence, not just an endorsement. Also, the DG10 code stays on your driving record for 11 years from the date of conviction, and it will be seen by any employer who checks your licence.

Can I reduce my drug-driving ban by completing a course?

Not at present. Some drink-driving bans can be shortened by the drink-drive rehabilitation course, but drug driving does not have a national equivalent.

Am I at risk of prison for driving over the BZE limit?

Prison can happen but is uncommon. Under the Sentencing Council guideline, custody is the starting point only in the most serious category, for example driving commercially or with alcohol or another drug in the blood, in combination with poor driving or obvious impairment. For this purpose, cocaine and BZE found together count as a single drug.

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.