Charged Over BZE? 8 Things About Benzoylecgonine and Driving in 2026

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

If benzoylecgonine is named in your blood test result, it is likely that you want to understand what it means, because you are probably facing an allegation of drug driving. Benzoylecgonine is a substance that forms when your body breaks down cocaine. In England and Wales, a criminal offence is committed by driving with too much of it in your blood, even where the driver felt completely fine.

The rest of this article covers what benzoylecgonine is, the legal limit, how police test for it, the possible penalties and what you can do next.

1. What is benzoylecgonine, put simply?

Put simply, benzoylecgonine (BZE) is the main metabolite of cocaine, the chemical your body produces as it breaks cocaine down. It does not, on its own, have an intoxicating effect. Finding it in your blood is nonetheless strong evidence that cocaine has been used.

Police test for BZE in drug-driving cases because it is one of the substances so closely linked to cocaine. In paperwork, you may see BZE or a cocaine metabolite named.

2. How does benzoylecgonine remain detectable after cocaine wears off?

The body takes more time to clear BZE than cocaine itself. Benzoylecgonine therefore remains detectable after the effects of cocaine have worn off, and you could feel completely sober while having a measurable level.

Factors such as how much was taken, how often and your individual metabolism affect how long it remains. As a result, no reliable "safe" waiting time before driving exists.

3. Is it an offence to drive when BZE is in your blood?

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

Listing the drugs covered and their limits, The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 treat cocaine and benzoylecgonine separately. Either reading, then, can lead to a charge. A separate offence with different penalties covers being "in charge" of a vehicle while over the limit, such as sitting in a parked car with the keys, and that offence is endorsed as DG40.

4. What is the legal benzoylecgonine limit?

In England and Wales, the benzoylecgonine legal limit for drivers is 50 micrograms per litre of blood (µg/L), and the limit for cocaine itself is lower, at 10 µg/L.

The government took a zero-tolerance approach towards illegal drugs such as cocaine. Rather than setting limits at a level linked to impairment, it set them at a level that rules out accidental exposure. Results from laboratories are given as "not less than" a figure to allow for measurement uncertainty. Treating the limit as a "safe" amount is never appropriate, then, because any recent cocaine use may put a driver over it.

5. Can you be convicted of drug driving even without impairment?

Yes. The prosecution only has to prove, for the section 5A offence, that you were driving and your blood level was above the specified limit, with no need to show that your driving was affected.

This differs from driving while unfit through drugs, the separate offence under section 4 of the Road Traffic Act 1988, which requires evidence of impairment. Some drivers are investigated for both, so be sure to check which offence you face.

6. How do police carry out cocaine and BZE tests?

A saliva swab is used by police for a roadside preliminary drug test that screens for cocaine and cannabis. A positive screen alone cannot convict you, but it does enable the police to arrest you.

At the police station, a doctor or healthcare professional takes a blood sample, which is then sent away for laboratory analysis. If you ask for part of the sample when it is taken, the law requires the sample to be divided, giving you a part for independent testing. Results can take weeks or even months, which is the reason many drivers are released to await the result.

Have you been charged, or sent a blood result that shows BZE? Drug Driving Solicitors can review your paperwork and walk you through your options.

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

It is the magistrates' court that hears these cases. A conviction brings with it 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 in the ten years before this one, three years becomes the minimum ban.

The endorsement code DG10 records the conviction on your licence, and it stays on your driving record for 11 years from the date of conviction. It is a criminal conviction, too, so it goes beyond a motoring matter.

As a practical consequence, insurance premiums can be much higher for years. Anyone driving for work should expect their employer to be able to see the conviction on their licence.

8. What can you do if you are charged?

Seek specialist advice before your first court hearing, because early decisions, including the way you plead, can affect the outcome. A solicitor may examine whether the correct procedures were followed, how your blood sample was taken, stored and analysed, and whether the evidence that you were driving is sound or not.

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

Advice on a benzoylecgonine drug-driving charge from specialists

Benzoylecgonine can stay in your blood after cocaine wears off. A reading above the limit is enough for a charge whether you felt impaired or not. Although the penalties are serious, how your case is prepared may affect the outcome.

Waiting for blood test results, or already charged? Drug Driving Solicitors is here to give you clear advice on your situation.

This article gives general information about the law in England and Wales and should not be taken as legal advice. Advice on your own circumstances should always be sought.

Frequently asked questions

Can I keep on driving ahead of my court hearing?

In most cases, yes. Being charged does not usually stop you driving, as the ban starts at sentencing. If the court convicts you but delays its sentencing decision, it can impose an interim ban in the meantime.

Will a drug-driving conviction leave me with a criminal record?

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

Can a course reduce the length of a drug-driving ban?

Not at present. Although the drink-drive rehabilitation course can shorten some drink-driving bans, drug driving has no national equivalent to it.

Is a prison sentence likely for driving over the BZE limit?

Going to prison is possible but uncommon. Custody is the starting point, according to the Sentencing Council guideline, 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. For this purpose, the presence of cocaine and BZE together is counted as one 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.