8 Things Drivers Should Know About Benzoylecgonine and Driving in 2026
Published by Drug Driving Solicitors, specialist defence lawyers for drug driving charges across England and Wales
Seeing benzoylecgonine named on a blood test result usually means a drug-driving allegation is probably on the way, and naturally you will want to know what that means for you. Put simply, benzoylecgonine is produced by your body as it breaks down cocaine. Having too much of it in your blood while driving is a criminal offence in England and Wales, and that remains true even if you felt completely fine.
The sections below explain what benzoylecgonine is, the legal limit, the way police test for it, the penalties you could face and the options open to you next.
1. Defining benzoylecgonine
Benzoylecgonine (BZE) is the chemical your body makes when it breaks cocaine down, which is why it is described as the main metabolite of cocaine. Although it has no intoxicating effect of its own, finding it in a blood sample is strong evidence that cocaine has been used.
BZE is so closely tied to cocaine that police include it among the substances they test for in drug-driving cases. You may see it written on paperwork as BZE or as a cocaine metabolite.
2. How benzoylecgonine can still show up after cocaine wears off
Cocaine leaves the body faster than BZE does. As a result, benzoylecgonine can be detected once the effects of cocaine have worn off, and someone can feel completely sober yet still have a measurable level.
How long it lasts depends on factors including the quantity taken, how often it was taken and your individual metabolism. There is no reliable "safe" waiting time before getting behind the wheel.
3. When driving with BZE in your blood becomes an offence
The answer is yes, provided the level is above the legal limit. In England and Wales, driving or attempting to drive with a specified drug in your blood above its set limit is an offence. It sits in section 5A of the Road Traffic Act 1988, and it came into force on 2 March 2015.
A list of the drugs covered, together with their limits, appears in The Drug Driving (Specified Limits) (England and Wales) Regulations 2014. Cocaine and benzoylecgonine are each listed separately, which means either reading can lead to a charge. Being "in charge" of a vehicle while over the limit (sitting in a parked car with the keys, for example) is a different offence altogether. It is endorsed as DG40 and carries different penalties.
4. The benzoylecgonine legal limit for drivers
In England and Wales, drivers have a benzoylecgonine legal limit of 50 micrograms per litre of blood (µg/L). For cocaine itself the limit is lower, at 10 µg/L.
The government took a zero-tolerance approach to illegal drugs such as cocaine, so the limits were set at a level that rules out accidental exposure instead of at a level linked to impairment. Laboratory results are given as "not less than" a figure to allow for measurement uncertainty. It follows that the limit should never be thought of as a "safe" amount. A driver may go over it after any recent cocaine use.
5. Conviction for drug driving without impairment
It is possible to be convicted. To prove the section 5A offence, the prosecution only has to show that you were driving and that your blood level was over the specified limit. There is no need to show that your driving was affected.
By contrast, the separate offence of driving while unfit through drugs, found in section 4 of the Road Traffic Act 1988, does require evidence of impairment. Because some drivers are investigated for both, check which offence you are facing.
6. How police test for cocaine and BZE
A roadside preliminary drug test can be carried out by police using a saliva swab, screening for cocaine and cannabis. A positive screen gives the police grounds to arrest you, but it cannot convict you alone.
Back at the police station, a doctor or healthcare professional takes a blood sample and sends it for laboratory analysis. The law requires the sample to be divided, with a part given to you for independent testing, if you ask for part of it when it is taken. Many drivers are released while they wait for the result, because results can take weeks or even months.
If you have been charged or have a blood result showing BZE, Drug Driving Solicitors can review your paperwork and talk you through your options.
7. DG10 drug-driving conviction penalties
Cases like these are dealt with in the magistrates' court. A conviction brings a mandatory disqualification of at least 12 months, an unlimited fine and up to six months' imprisonment. The minimum ban rises to three years for anyone convicted of a relevant drink-driving or drug-driving offence in the ten years before this one.
The endorsement code DG10 is recorded on your licence and stays on your driving record for 11 years from the date of conviction. Beyond being a motoring matter, it is also a criminal conviction.
This can, in practice, lead to much higher insurance premiums for years. For anyone who drives for work, the conviction on the licence will be visible to the employer.
8. Your options after a drug-driving charge
Early decisions, including how you plead, can affect the outcome, so obtain specialist advice before your first court hearing. Among the things a solicitor may examine are 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, when deciding the sentence, that drugs were consumed unknowingly, for instance through a spiked drink. If a conviction is likely, strong mitigation may still influence both the fine and how far the ban goes above the minimum. Since every case depends on its own facts, no particular outcome can be guaranteed.
Speak to us about a benzoylecgonine drug-driving charge
Cocaine can wear off while benzoylecgonine stays in your blood, and whether or not you felt impaired, a reading above the limit is enough for a charge. The penalties are serious. Even so, the way your case is prepared may affect the outcome.
Speak to Drug Driving Solicitors for clear advice on your situation if you have been charged or are waiting for blood test results.
The information in this article is general information about the law in England and Wales, not legal advice. Please get advice on your own circumstances.
Common questions
Can I carry on driving until my court hearing?
In most cases you can. A ban does not start until you are sentenced, so a charge does not usually stop you driving. Where the court convicts you but delays sentencing, an interim ban can be imposed in the meantime.
Will I have a criminal record after a drug-driving conviction?
You will. Driving above the specified limit is not just an endorsement but a criminal offence. The DG10 code also remains on your driving record for 11 years from the date of conviction, and it will be seen by employers who check your licence.
Can taking a course reduce a drug-driving ban?
At present, no. While the drink-drive rehabilitation course can shorten some drink-driving bans, drug driving has no national equivalent.
Is prison likely for driving over the BZE limit?
Prison is possible, but it is uncommon. In the Sentencing Council guideline, custody is the starting point only for 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 found together are treated 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.