Benzoylecgonine and Driving: 8 Things Worth Knowing in 2026

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

Benzoylecgonine is a substance the body produces while breaking down cocaine. If it appears in your blood test result, you are probably facing a drug-driving allegation and will want to know what that involves. In England and Wales, a driver with too much of it in their blood commits a criminal offence, even if they felt completely fine.

We set out below what benzoylecgonine is, the legal limit for it, the way police test for it, the penalties that could apply and what you can do from here.

1. Benzoylecgonine explained

Benzoylecgonine (BZE) is known as the main metabolite of cocaine. That term refers to the chemical the body makes as it breaks cocaine down. BZE does not have any intoxicating effect of its own, though finding it in your blood is strong evidence of cocaine having been used.

It is one of the substances that police test for in drug-driving cases, precisely because BZE is linked so closely to cocaine. Paperwork might describe it as BZE or as a cocaine metabolite.

2. The reason benzoylecgonine lingers after cocaine wears off

BZE is cleared by the body more slowly than cocaine. That explains why benzoylecgonine can be detected after cocaine's effects have worn off, and why a person may feel completely sober and still have a measurable level.

Factors such as the amount used, the frequency of use and your individual metabolism all influence how long it remains. When it comes to driving, there is no reliable "safe" waiting time.

3. Driving with BZE in your blood: is it an offence?

Where the level is above the legal limit, it is. England and Wales make it an offence to drive, or attempt to drive, while a specified drug is in your blood above its set limit. Found in section 5A of the Road Traffic Act 1988, the offence came into force on 2 March 2015.

The drugs and their limits are listed in The Drug Driving (Specified Limits) (England and Wales) Regulations 2014. That list includes cocaine and benzoylecgonine separately, so a charge may result from either reading. Different penalties apply to the separate offence of being "in charge" of a vehicle while over the limit, which covers situations such as sitting in a parked car with the keys and is endorsed as DG40.

4. The legal limit for benzoylecgonine

Drivers in England and Wales are subject to a benzoylecgonine legal limit of 50 micrograms per litre of blood (µg/L). Cocaine itself has a lower limit of 10 µg/L.

Limits for illegal drugs such as cocaine reflect the government's zero-tolerance approach: they were set at a level that rules out accidental exposure, and not at a level linked to impairment. Laboratories report results as "not less than" a figure, which allows for measurement uncertainty. For these reasons, the limit should never be treated as a "safe" amount. Recent cocaine use of any kind may put a driver above it.

5. Drug-driving convictions where there was no impairment

A conviction can still follow. The section 5A offence only requires the prosecution to prove that you were driving and that your blood level exceeded the specified limit, without any need to show that your driving was affected.

That differs from driving while unfit through drugs, a separate offence under section 4 of the Road Traffic Act 1988 that requires evidence of impairment. Some drivers find themselves investigated for both, so check which offence you are dealing with.

6. Police testing for cocaine and BZE

Police may use a saliva swab to carry out a roadside preliminary drug test, which screens for cocaine and cannabis. That positive screen cannot convict you on its own, but the police can arrest you on the strength of it.

A blood sample is then taken at the police station by a doctor or healthcare professional and sent off for laboratory analysis. You can ask for part of the sample when it is taken, and if you do, the law requires the sample to be divided and a part given to you for independent testing. Since results can take weeks or even months, many drivers are released while they wait for them.

Has a charge or a blood result showing BZE come through? Drug Driving Solicitors can review the paperwork with you and explain what options you have.

7. Penalties for a DG10 drug-driving conviction

Proceedings take place in the magistrates' court. Conviction carries a mandatory disqualification of at least 12 months, along with an unlimited fine and up to six months' imprisonment. The minimum ban becomes three years if you were convicted of a relevant drink-driving or drug-driving offence in the ten years before this one.

Your licence is endorsed with the code DG10, and it stays on your driving record for 11 years from the date of conviction. The conviction is also criminal, so it is not just a motoring matter.

Much higher insurance premiums for years can be one practical result. If driving is part of your work, your employer will be able to see the conviction on your licence.

8. Steps to take if you have been charged

Before your first court hearing, get specialist advice, as early decisions (including how you plead) can affect the outcome. Your solicitor may examine whether the correct procedures were followed, the way your blood sample was taken, stored and analysed, and whether the evidence that you were driving is sound.

Drugs taken unknowingly, for example through a spiked drink, are something the court can take into account when it decides the sentence. Where conviction looks likely, strong mitigation may still influence the fine and the length of any ban above the minimum. Each case depends on its own facts, which means no particular outcome can be guaranteed.

Benzoylecgonine drug-driving charge: getting advice

Benzoylecgonine can remain in your blood once cocaine wears off. A reading above the limit is enough for a charge, regardless of whether you felt impaired. While the penalties are serious, the preparation of your case may affect the outcome.

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

Please note that this article is general information about the law in England and Wales and is not legal advice. You should seek advice on your own circumstances.

Your questions answered

Is it possible to drive before my court hearing?

Yes, in most cases. A ban starts at sentencing, which is why being charged does not usually stop you driving. Should the court convict you and then delay sentencing, it can impose an interim ban until that point.

Is a criminal record the result of a drug-driving conviction?

Yes. It is a criminal offence to drive above the specified limit, not merely an endorsement. Employers who check your licence will also see the DG10 code, which stays on your driving record for 11 years from the date of conviction.

Could a course cut the length of a drug-driving ban?

No, not at present. Drug driving has no national equivalent to the drink-drive rehabilitation course, which is able to shorten some drink-driving bans.

Am I going to prison for driving over the BZE limit?

Prison is a possibility but uncommon. The Sentencing Council guideline makes custody the starting point only in the most serious category, such as 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 a single 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.