8 Things to Check About Benzoylecgonine and Driving in 2026
Published by Drug Driving Solicitors, specialist defence lawyers for drug driving charges across England and Wales
Even if you felt completely fine behind the wheel, driving in England and Wales with too much benzoylecgonine in your blood is a criminal offence. This substance is produced as your body breaks down cocaine. So if your blood test result mentions it, you are probably facing a drug-driving allegation and will want to know exactly what it means.
Our guide sets out what benzoylecgonine is, what the legal limit is, how police test for it, what penalties you could face and what you can do next.
1. What is benzoylecgonine, chemically speaking?
When cocaine is broken down, the chemical left behind by your body is benzoylecgonine (BZE), which makes it the main metabolite of cocaine. BZE is without any intoxicating effect of its own. Discovering it in your blood, though, is strong evidence that cocaine has been used.
Its strong connection to cocaine is why BZE ranks among the substances police test for in drug-driving cases. It might be labelled on paperwork as BZE or as a cocaine metabolite.
2. Why benzoylecgonine shows up after cocaine has worn off
There is a simple reason benzoylecgonine can be detected after the effects of cocaine have worn off: BZE is cleared from the body at a slower pace than cocaine. A driver can feel completely sober and nonetheless have a measurable level.
How long it stays is shaped by factors such as the amount taken, the frequency of use and your individual metabolism. You cannot rely on any "safe" waiting time before driving, as no reliable one exists.
3. At what point is it an offence to drive with BZE in your blood?
When the level is above the legal limit, it is an offence. In England and Wales, a person commits an offence by driving, or attempting to drive, with a specified drug in their blood above its set limit. That offence, contained in section 5A of the Road Traffic Act 1988, came into force on 2 March 2015.
The drugs that are covered, and the limits for each, are listed in The Drug Driving (Specified Limits) (England and Wales) Regulations 2014. Because those regulations list cocaine and benzoylecgonine separately, a charge can be brought on either reading. Being "in charge" of a vehicle while over the limit is a separate offence, which might arise from sitting in a parked car with the keys. Its endorsement is DG40, and its penalties are different.
4. The benzoylecgonine legal limit in numbers
Drivers in England and Wales face a benzoylecgonine legal limit of 50 micrograms per litre of blood (µg/L). A lower limit of 10 µg/L covers cocaine itself.
In line with its zero-tolerance approach to illegal drugs such as cocaine, the government set limits at a level that rules out accidental exposure, not a level linked to impairment. Measurement uncertainty is allowed for by laboratories, which report each result as "not less than" a figure. No driver should therefore treat the limit as a "safe" amount: any recent cocaine use may put them over it.
5. Can you be convicted of drug driving with no impairment?
You can. The section 5A offence asks the prosecution to prove only that you were driving and that your blood level was over the specified limit. Showing any effect on your driving is not part of what it must prove.
The position is different for driving while unfit through drugs, which is a separate offence under section 4 of the Road Traffic Act 1988 and requires evidence of impairment. Some drivers are investigated for both offences, so it is worth confirming which one you face.
6. How cocaine and BZE testing by police works
The first step may be a roadside preliminary drug test, which the police carry out using a saliva swab that screens for cocaine and cannabis. A positive screen alone cannot convict you, but on the basis of it the police can arrest you.
The second step takes place at the police station, where a doctor or healthcare professional takes a blood sample to be sent for laboratory analysis. If you ask for part of the sample at the time it is taken, the law requires it to be divided, and you must receive a part for independent testing. Because results can take weeks or even months, many drivers are released while they await the result.
Charged, or given a blood result that shows BZE? Drug Driving Solicitors can review the paperwork and lay out your options.
7. What penalties come with a DG10 drug-driving conviction?
Cases of this type are heard at the magistrates' court. A conviction involves a mandatory disqualification of at least 12 months, and also carries an unlimited fine and up to six months' imprisonment. The minimum ban climbs to three years if you were convicted of a relevant drink-driving or drug-driving offence in the ten years leading up to this one.
Recorded on your licence with the endorsement code DG10, the conviction stays on your driving record for 11 years from the date of conviction. It is more than just a motoring matter, as it is a criminal conviction too.
In real terms, it can mean much higher insurance premiums for years. If you drive for work, your employer will be able to see this conviction on your licence.
8. What options do you have after a charge?
Before your first court hearing, make sure you get specialist advice. Early decisions, the plea you enter among them, can affect the outcome. There are several points 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.
The court can take into account unknowing consumption of drugs, such as through a spiked drink, at the point of deciding the sentence. Even if a conviction is likely, strong mitigation may still influence the fine and the length of the ban above the minimum. With every case depending on its own facts, no particular outcome can be guaranteed.
Getting help with a benzoylecgonine drug-driving charge
After cocaine wears off, benzoylecgonine can still stay in your blood. A charge can be brought on a reading above the limit, regardless of whether you felt impaired. The penalties are serious; nonetheless, how your case is prepared may affect the outcome.
Contact Drug Driving Solicitors for clear advice on your situation if you have been charged or are still waiting for blood test results.
This article is meant as general information about the law in England and Wales, and is not legal advice. Please seek advice that covers your own circumstances.
Frequently asked questions
Does a charge stop me driving before my court hearing?
In most cases, no. A ban starts on sentencing, so being charged does not usually stop you from driving. If the court convicts you but delays sentencing, it can, however, impose an interim ban in the meantime.
Is a criminal record the consequence of a drug-driving conviction?
Yes. A driver above the specified limit commits a criminal offence, which is a step beyond just an endorsement. The DG10 code also stays on your driving record for 11 years from the date of conviction, meaning employers who check your licence will see it.
Can attending a course reduce a drug-driving ban?
Not at present. Although some drink-driving bans can be shortened by the drink-drive rehabilitation course, no national equivalent exists for drug driving.
Am I likely to go to prison for driving over the BZE limit?
Prison is possible, though it is uncommon. The Sentencing Council guideline treats custody as the starting point only in its 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 found together count as one drug for that 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.