Your Guide to Benzoylecgonine and Driving: 8 Things to Know in 2026

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

It can be worrying to see benzoylecgonine mentioned in your blood test result. You are probably facing a drug-driving allegation and want to know what the result means. Benzoylecgonine is made by your body as it breaks down cocaine. Driving with too much of it in your blood is a criminal offence in England and Wales, even for someone who felt completely fine.

We explain below what benzoylecgonine is, the legal limit, how the police test for it, the penalties that could follow and what your next steps might be.

1. What is benzoylecgonine, and where does it come from?

Benzoylecgonine (BZE) comes from cocaine. As the main metabolite of cocaine, it is the chemical your body produces in breaking cocaine down. There is no intoxicating effect attached to BZE on its own, but finding it in your blood is strong evidence that cocaine has been used.

Being so closely linked to cocaine, BZE is one of the substances police test for whenever a drug-driving case arises. The paperwork you receive may call it BZE or a cocaine metabolite.

2. Why benzoylecgonine can outlast the effects of cocaine

Benzoylecgonine can be detected after the effects of cocaine have worn off. This is because the body clears BZE more slowly than it clears cocaine itself, so feeling completely sober is no indication that there is no measurable level.

How much was taken, how often it was taken and your individual metabolism are some of the factors that determine how long it remains. No reliable "safe" waiting time before driving is available.

3. Is it an offence to drive with BZE present in your blood?

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

The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 set out the drugs covered and their limits, listing cocaine and benzoylecgonine separately. That is why a charge can come from either reading. Being "in charge" of a vehicle while over the limit, sitting in a parked car with the keys for instance, is a separate offence. It is endorsed as DG40 and attracts different penalties.

4. Benzoylecgonine legal limit: the figures

Drivers in England and Wales have a benzoylecgonine legal limit of 50 micrograms per litre of blood (µg/L). The limit for cocaine itself is set lower, at 10 µg/L.

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

5. Drug driving and impairment: can you be convicted without it?

Yes. The prosecution need only prove, for the section 5A offence, that you were driving and that your blood level was over the specified limit. No proof that your driving was affected is required.

The offence of driving while unfit through drugs is a separate one, under section 4 of the Road Traffic Act 1988, and it does require evidence of impairment. Because some drivers are investigated for both, check the offence you are facing.

6. Police methods for testing cocaine and BZE

Police can carry out a roadside preliminary drug test using a saliva swab, which screens for both cocaine and cannabis. A positive screen will not convict you by itself, but it gives the police the ability to arrest you.

At the police station, a blood sample is taken from you by a doctor or healthcare professional and dispatched for laboratory analysis. If you ask for part of the sample as it is taken, the law requires that it be divided and that a part go to you for independent testing. Results can take weeks or even months, and for this reason many drivers are released as they wait.

If you have received a charge or a blood result that shows BZE, ask Drug Driving Solicitors to review your paperwork and explain your options.

7. Penalties linked to a DG10 drug-driving conviction

The magistrates' court deals with these cases. A conviction carries a mandatory disqualification lasting at least 12 months, an unlimited fine and up to six months' imprisonment. For anyone with a conviction for a relevant drink-driving or drug-driving offence in the ten years before this one, the minimum ban rises to three years.

DG10 is the endorsement code recorded on your licence for the conviction, and it stays on your driving record for 11 years from the date of conviction. It is a criminal conviction as well, not just a motoring matter.

In practice, this may bring much higher insurance premiums for years. If you drive for work, your employer is going to be able to see the conviction on your licence.

8. What you can do once charged

Getting specialist advice before your first court hearing is vital, since early decisions, among them 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 the evidence that you were driving holds up as sound.

Where you consumed drugs unknowingly, through a spiked drink for example, the court can take this into account as it decides the sentence. If a conviction is likely, strong mitigation may still influence the fine and the length of the ban above the minimum. Every case depends on its own facts, and so no particular outcome can be promised or guaranteed.

Advice on benzoylecgonine drug-driving charges

After cocaine wears off, benzoylecgonine may still be in your blood, and a reading above the limit is enough for a charge whether or not you felt impaired. The penalties are serious. Still, how your case is prepared may affect the outcome.

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

This article offers general information about the law in England and Wales and is not legal advice. Please seek advice on your individual circumstances.

Frequently asked questions

Can I drive in the period before my court hearing?

Yes, in most cases. Being charged does not usually stop you from driving, since a ban only starts once you are sentenced. If the court convicts you and then delays sentencing, it can impose an interim ban during the meantime.

Is a criminal record part of a drug-driving conviction?

Yes, it is. Driving above the specified limit is a criminal offence and goes beyond an endorsement. The DG10 code also stays on your driving record for 11 years from the date of conviction, and any employer who checks your licence will see it.

Can a course be used to reduce a drug-driving ban?

Not at present. The drink-drive rehabilitation course, which can shorten certain drink-driving bans, does not have a national equivalent for drug driving.

Is prison the outcome for driving over the BZE limit?

Prison remains possible, but it is uncommon. Under the Sentencing Council guideline, custody is the starting point only in the most serious category, which includes, for example, driving commercially or with alcohol or another drug in the blood, combined with poor driving or obvious impairment. For this purpose, cocaine and BZE found together are treated 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.