Benzoylecgonine and Driving in 2026: The 8 Things You Should Be Aware Of

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

A mention of benzoylecgonine in your blood test result will probably mean that a drug-driving allegation is being made against you. You will want to know what that means. Benzoylecgonine is produced in the body during the breakdown of cocaine, and in England and Wales a driver with too much of it in their blood is committing a criminal offence, even if they felt completely fine.

This page explains what benzoylecgonine is, the legal limit, how the police test for it, the penalties that could be imposed and what you can do next.

1. Benzoylecgonine: a definition

Benzoylecgonine (BZE) is the substance described as the main metabolite of cocaine. Put another way, it is the chemical that results when your body breaks cocaine down. While it produces no intoxicating effect of its own, finding it in your blood is strong evidence of cocaine use.

Given how closely it is linked to cocaine, BZE is one of the substances police test for in drug-driving cases. It may be called BZE on your paperwork, or a cocaine metabolite.

2. What keeps benzoylecgonine detectable after cocaine wears off?

The explanation lies in how slowly the body clears BZE compared with cocaine itself. That slower clearance allows benzoylecgonine to be detected after the effects of cocaine have worn off. A person can feel completely sober and still carry a measurable level.

Its duration depends on factors such as quantity, frequency and your individual metabolism. A reliable "safe" waiting time before driving does not exist for anyone.

3. Do you commit an offence by driving with BZE in your blood?

You do if the level is above the legal limit. In England and Wales, an offence is committed by anyone who drives, or attempts to drive, with a specified drug in their blood above its set limit. That offence was introduced in section 5A of the Road Traffic Act 1988 and came into force on 2 March 2015.

The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 contain the list of drugs covered and their limits. Separate listings for cocaine and benzoylecgonine mean a charge can follow either reading. Another offence, separate from this one, covers being "in charge" of a vehicle while over the limit, such as sitting in a parked car with the keys. It has different penalties and is endorsed as DG40.

4. The benzoylecgonine legal limit: what is it?

The benzoylecgonine legal limit for drivers is 50 micrograms per litre of blood (µg/L) in England and Wales. Lower than that, at 10 µg/L, is the limit for cocaine itself.

A zero-tolerance approach was taken by the government for illegal drugs such as cocaine, with limits set at a level that rules out accidental exposure instead of a level linked to impairment. Laboratory results appear as "not less than" a figure, allowing for measurement uncertainty. It is therefore wrong to treat the limit as a "safe" amount: any recent cocaine use may put a driver above it.

5. Is a conviction for drug driving possible without impairment?

Yes. To prove the section 5A offence, the prosecution has only to establish that you were driving and that your blood level exceeded the specified limit. It does not have to demonstrate that your driving was affected.

That is unlike the separate offence of driving while unfit through drugs, which falls under section 4 of the Road Traffic Act 1988 and requires evidence of impairment. You should check which offence you face, since some drivers are investigated for both.

6. Police tests for cocaine and BZE

A roadside preliminary drug test may be carried out by the police using a saliva swab, screening for cocaine and cannabis. Although a positive screen alone cannot convict you, the police can arrest you because of it.

Your blood sample is taken at the police station by a doctor or healthcare professional and sent on for laboratory analysis. The law requires that the sample be divided and a part given to you for independent testing, provided you ask for part of it when it is taken. Results can take weeks or even months, which is why many drivers are released to wait for them.

Have you received a charge or a blood result showing BZE? Let Drug Driving Solicitors review your paperwork and explain your options.

7. What penalties apply to a DG10 drug-driving conviction?

These cases are heard at the magistrates' court. Upon conviction, there is a mandatory disqualification of at least 12 months, an unlimited fine and up to six months' imprisonment. A previous conviction for a relevant drink-driving or drug-driving offence within ten years before this one takes the minimum ban up to three years.

Your licence records the conviction with the endorsement code DG10, and that code stays on your driving record for 11 years from the date of conviction. The conviction is a criminal one, too, rather than just a motoring matter.

Much higher insurance premiums for years are one possible consequence in practice. If you drive for work, your employer will be able to see the conviction recorded on your licence.

8. What can you do after a charge?

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

The court can take into account, when it decides the sentence, any unknowing consumption of drugs, for example through a spiked drink. Where a conviction is likely, the fine and the length of the ban above the minimum may still be influenced by strong mitigation. As every case depends on its own facts, no particular outcome can be guaranteed.

Getting the right advice on a benzoylecgonine drug-driving charge

Benzoylecgonine is able to stay in your blood after cocaine wears off, and a reading above the limit is enough for a charge, irrespective of whether you felt impaired. The penalties are serious. How your case is prepared, though, may affect the outcome.

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

The content of this article is general information about the law in England and Wales. It does not constitute legal advice, and you should seek advice on your own circumstances.

Questions people often ask

Is driving still allowed before my court hearing?

Yes, in most cases. Since a ban starts when you are sentenced, being charged does not normally stop you driving. If the court convicts you but delays sentencing, an interim ban can be imposed for the period in between.

Will a drug-driving conviction show as a criminal record?

Yes. Driving above the specified limit is a criminal offence, not merely an endorsement. Also, the DG10 code stays on your driving record for 11 years from the date of conviction, so employers who check your licence will see it.

Will a course reduce my drug-driving ban?

Not at present. The drink-drive rehabilitation course may shorten some drink-driving bans, but there is no national equivalent of it for drug driving.

Does driving over the BZE limit mean prison?

Prison is possible, though uncommon. Custody, under the Sentencing Council guideline, is 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, when found together, count 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.