8 Important Things About Benzoylecgonine and Driving Every Driver Should Know in 2026

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

Drivers who see benzoylecgonine on a blood test result are probably facing a drug-driving allegation, and most want to know straight away what it means. It is a substance produced by the body in breaking down cocaine. In England and Wales, having too much of it in your blood while you drive is a criminal offence, even if you felt completely fine.

Below you will find an explanation of what benzoylecgonine is, the legal limit, how police test for it, the penalties you could face, and the next steps you can take.

1. An introduction to benzoylecgonine

Your body produces a chemical called benzoylecgonine (BZE) when it breaks cocaine down. This makes it the main metabolite of cocaine. Benzoylecgonine has no intoxicating effect of its own, though its presence in your blood is strong evidence that cocaine has been used.

In drug-driving cases, BZE is one of the substances the police test for, thanks to how closely it is linked to cocaine. Paperwork can describe it as BZE or a cocaine metabolite.

2. Benzoylecgonine and the time after cocaine wears off

Your body clears cocaine faster than it clears BZE. That is the reason benzoylecgonine can be detected after the effects of cocaine have worn off, and it is entirely possible to feel completely sober with a measurable level present.

How long it stays will depend on factors including how much was taken, how often, and your individual metabolism. There is simply no reliable "safe" waiting time before driving.

3. Can driving with BZE in your blood be an offence?

Yes, once the level is above the legal limit. It is an offence in England and Wales to drive, or attempt to drive, with a specified drug in your blood that is above its set limit. Section 5A of the Road Traffic Act 1988 holds the offence, and it came into force on 2 March 2015.

The drugs covered are listed, along with their limits, in The Drug Driving (Specified Limits) (England and Wales) Regulations 2014. Cocaine and benzoylecgonine have separate entries, meaning that either reading can result in a charge. A separate offence applies to anyone "in charge" of a vehicle while over the limit, for example sitting in a parked car with the keys. That offence is endorsed as DG40, and the penalties differ.

4. Understanding the benzoylecgonine legal limit

For England and Wales, the benzoylecgonine legal limit for drivers is fixed at 50 micrograms per litre of blood (µg/L). Cocaine itself carries a lower limit, which is 10 µg/L.

The government took a zero-tolerance approach for illegal drugs such as cocaine, and so set the limits at a level that rules out accidental exposure, not at a level linked to impairment. Laboratory results are reported as "not less than" a figure, allowing for measurement uncertainty. The limit, then, should never be treated as a "safe" amount, since any recent cocaine use may put a driver over it.

5. Is it possible to be convicted of drug driving without impairment?

Yes, it is. The section 5A offence requires the prosecution to prove nothing more than that you were driving and that your blood level was above the specified limit. It need not show any effect on your driving.

Driving while unfit through drugs, under section 4 of the Road Traffic Act 1988, is a separate offence, and for that one evidence of impairment is required. Because some drivers are investigated for both offences, it pays to check which one you face.

6. Cocaine and BZE testing by the police

The police may carry out a roadside preliminary drug test, using a saliva swab to screen for cocaine and cannabis. It allows them to arrest you, but a positive screen alone cannot convict you.

At the police station, a doctor or healthcare professional will take a blood sample, which is sent for laboratory analysis. Ask for part of the sample when it is taken, and the law requires it to be divided, with a part given to you for independent testing. With results sometimes taking weeks or even months, many drivers are released while they wait.

If you have received a charge or a blood result showing BZE, Drug Driving Solicitors is able to review your paperwork and explain your options.

7. What a DG10 drug-driving conviction can mean

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

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

In practice, much higher insurance premiums for years may result. If your work involves driving, your employer will be able to see the conviction on your licence.

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

Get specialist advice before the first court hearing, as early decisions can affect the outcome, including the decision on how to plead. A solicitor may consider whether the correct procedures were followed, how your blood sample was taken, stored and analysed, and whether the evidence of your driving is sound.

Where drugs were consumed unknowingly, such as through a spiked drink, the court can take that into account in deciding the sentence. Strong mitigation may still influence the length of the ban above the minimum, and the fine, if a conviction is likely. Since every case depends on its own facts, it is not possible to guarantee any particular outcome.

Advice for anyone facing a benzoylecgonine drug-driving charge

Once cocaine wears off, benzoylecgonine can still stay in your blood. Whether or not you felt impaired, a reading above the limit is sufficient for a charge. The penalties are serious, but your case's preparation may affect the outcome.

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

This article sets out general information about the law in England and Wales; it is not legal advice. We would ask you to seek advice on your own circumstances.

Frequently asked questions

Can I drive while waiting for my court hearing?

Yes, in most cases. Being charged does not usually stop you driving, because any ban starts at the time you are sentenced. Where the court convicts you but delays sentencing, it can put an interim ban in place in the meantime.

Can a drug-driving conviction give me a criminal record?

Yes, it can. Driving above the specified limit is a criminal offence rather than just an endorsement. The DG10 code will also stay on your driving record for 11 years from the date of conviction, visible to employers who check your licence.

Does any course reduce a drug-driving ban?

Not at present. The drink-drive rehabilitation course can shorten some drink-driving bans, but no national equivalent is available for drug driving.

How likely is prison for driving over the BZE limit?

Custody is a possibility, but it is uncommon. The Sentencing Council guideline makes custody 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 detected together are treated 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.