Understanding Benzoylecgonine and Driving: 8 Things for 2026

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

A blood test result naming benzoylecgonine can be confusing. If you have received one, you are probably facing a drug-driving allegation and want to know what it means. As cocaine is broken down, your body produces benzoylecgonine. Driving with too much of it in your blood is a criminal offence in England and Wales, and how you felt at the time, even if completely fine, does not change that.

We explain here what benzoylecgonine is, the legal limit, the way police test for it, the penalties you may face, and what you can do next.

1. Benzoylecgonine: what is this substance?

Of all the products of cocaine metabolism, benzoylecgonine (BZE) is the main metabolite of cocaine: the chemical your body produces whenever it breaks cocaine down. BZE has no intoxicating effect by itself, but its presence in your blood is strong evidence that cocaine has been used.

The close link between BZE and cocaine is the reason police test for it in drug-driving cases. On paperwork, it could be described as BZE or as a cocaine metabolite.

2. Detectable after cocaine wears off: why benzoylecgonine stays

Cocaine is cleared quickly compared with BZE, which the body removes more slowly. Because of that difference, benzoylecgonine can be detected after the effects of cocaine have worn off. Feeling completely sober and having a measurable level are not mutually exclusive.

How long it remains varies with factors such as how much was taken, how often, and your individual metabolism. A reliable "safe" waiting time before driving cannot be identified.

3. Is driving with BZE in your bloodstream an offence?

Yes, provided 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 above its set limit. This is set out in section 5A of the Road Traffic Act 1988, in force from 2 March 2015.

The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 list the covered drugs and their limits. In those regulations, cocaine and benzoylecgonine are listed separately, so a charge can follow from either reading. Being "in charge" of a vehicle while over the limit, sitting in a parked car with the keys being one example, is a separate offence. Endorsed as DG40, it carries different penalties.

4. Benzoylecgonine legal limit: how much is too much?

Set by law, the benzoylecgonine legal limit for drivers in England and Wales stands at 50 micrograms per litre of blood (µg/L). For cocaine, the limit is lower, at 10 µg/L.

The government followed a zero-tolerance approach for illegal drugs such as cocaine, setting limits at a level that rules out accidental exposure and not one linked to impairment. To allow for measurement uncertainty, laboratory results are reported as "not less than" a figure. On that basis, the limit should never be thought of as a "safe" amount. Cocaine used at any point recently may leave a driver over it.

5. Is it possible to be convicted of drug driving if you were unimpaired?

It is. For a section 5A offence, the prosecution only has to prove that you were driving and that the level in your blood exceeded the specified limit. There is no requirement to show that your driving was affected.

By comparison, driving while unfit through drugs, a separate offence under section 4 of the Road Traffic Act 1988, requires evidence of impairment. Some drivers are investigated for both, so it is sensible to check which offence you face.

6. Roadside and blood testing for cocaine and BZE

At the roadside, the police may carry out a preliminary drug test with a saliva swab, which screens for cocaine and cannabis. Though a positive screen alone cannot convict you, it allows the police to arrest you.

At the police station, a blood sample is then taken by a doctor or healthcare professional and passed on 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 to be given to you so you can arrange independent testing. Results can take weeks or even months, so many drivers are released while waiting for them.

Have you been charged, or has a blood result shown BZE? Drug Driving Solicitors can review your paperwork and explain your options to you.

7. DG10 drug-driving conviction: what penalties apply?

Hearings for these cases take place in the magistrates' court. A conviction carries a mandatory disqualification of at least 12 months, alongside an unlimited fine and up to six months' imprisonment. If you were convicted of a relevant drink-driving or drug-driving offence in the previous ten years, the minimum ban rises to three years.

The conviction is recorded on your licence with endorsement code DG10, which stays on your driving record for 11 years from the date of conviction. Do not mistake it for just a motoring matter: it is also a criminal conviction.

In practice, it can lead to much higher insurance premiums for years. If you drive for work, the conviction will be visible to your employer on your licence.

8. After a charge: what can you do?

Get specialist advice before the first court hearing, given that early decisions, including how 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 there is sound evidence that you were driving.

If you took drugs unknowingly, for example through a spiked drink, the court can take this into account when deciding the sentence. Where a conviction is likely, strong mitigation may still influence the fine as well as the length of the ban above the minimum. Every case depends on its own facts, so no one can guarantee a particular outcome.

Advice on your benzoylecgonine drug-driving case

Benzoylecgonine can stay in your blood after cocaine wears off, and whether or not you felt impaired, a reading above the limit is enough for a charge. Serious as the penalties are, careful preparation of your case may affect the outcome.

If you have been charged or are awaiting the results of a blood test, speak to Drug Driving Solicitors for clear advice on your situation.

Everything in this article is general information about the law in England and Wales rather than legal advice. Please obtain advice on your own circumstances.

Frequently asked questions

Can I drive normally before my court hearing?

In most cases, yes. A charge does not usually stop you driving, because a ban begins when you are sentenced. If the court convicts you but delays sentencing, it may impose an interim ban for the meantime.

Will I get a criminal record from a drug-driving conviction?

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

Can I take a course and reduce a drug-driving ban?

Not at present. The drink-drive rehabilitation course, able to shorten some drink-driving bans, has no national equivalent for drug driving.

Could I go to prison for driving over the BZE limit?

A prison term is possible but uncommon. The Sentencing Council guideline reserves custody as the starting point for the most serious category only, which covers cases such as driving commercially or with alcohol or another drug in the blood, combined with poor driving or obvious impairment. When cocaine and BZE are both found, they 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.