Benzoylecgonine and Driving: 8 Things to Know About the Law in 2026
Published by Drug Driving Solicitors, specialist defence lawyers for drug driving charges across England and Wales
If benzoylecgonine appears in your blood test result, you are probably facing a drug-driving allegation, and the meaning of it will be your first concern. Produced by the body when it breaks down cocaine, benzoylecgonine is a substance that drivers in England and Wales must not have in their blood in excess. Doing so is a criminal offence, even if you felt completely fine.
Below we explain what benzoylecgonine is, the legal limit, how police test for it, the penalties you could face and what you can do next.
1. Benzoylecgonine and what it tells investigators
Benzoylecgonine (BZE) is produced by your body as it breaks cocaine down, and as such it is the main metabolite of cocaine. It has no intoxicating effect of its own. What it does provide, when found in your blood, is strong evidence that cocaine has been used.
In drug-driving cases, the police test for BZE as one of their substances because it is so closely linked to cocaine. Paperwork might list it as BZE or as a cocaine metabolite.
2. Why benzoylecgonine remains after cocaine wears off
The body clears BZE more slowly than it clears cocaine, which allows benzoylecgonine to be detected once the effects of cocaine have worn off. A measurable level can exist in someone who feels completely sober.
How long it remains will vary with factors such as how much was taken, how often, and the individual metabolism of the person concerned. There is no reliable "safe" waiting time, so no one should rely on one before driving.
3. Is driving with BZE in your blood against the law?
It is, once the level is above the legal limit. The offence, in England and Wales, is to drive, or attempt to drive, with a specified drug in your blood above its set limit. Contained in section 5A of the Road Traffic Act 1988, it came into force on 2 March 2015.
The drugs covered by the offence and their limits are listed in The Drug Driving (Specified Limits) (England and Wales) Regulations 2014. As cocaine and benzoylecgonine have separate listings, a charge can follow from either reading. Being "in charge" of a vehicle while over the limit is another, separate offence, covering situations such as sitting in a parked car with the keys. It carries the endorsement DG40, and its penalties are different.
4. How high is the benzoylecgonine legal limit?
In England and Wales, a benzoylecgonine legal limit of 50 micrograms per litre of blood (µg/L) applies to drivers. Cocaine itself has a lower limit, which is set at 10 µg/L.
For illegal drugs such as cocaine, the government took a zero-tolerance approach. It set limits at a level that rules out accidental exposure, and not at a level linked to impairment. Results from the laboratory are expressed as "not less than" a figure, allowing for measurement uncertainty. That means the limit should never be treated as a "safe" amount, since any recent cocaine use may put a driver over the line.
5. Is it possible to be found guilty of drug driving without impairment?
Yes, it is possible. For the section 5A offence, proof that you were driving and that your blood level was above the specified limit is all the prosecution needs. Any effect on your driving does not have to be shown.
In contrast, the offence of driving while unfit through drugs, which is separate and falls under section 4 of the Road Traffic Act 1988, requires evidence of impairment. Some drivers are investigated for both offences, so it is important to check which offence you face.
6. What tests are used for cocaine and BZE by the police?
A roadside preliminary drug test, carried out with a saliva swab, can be used by police to screen for cocaine and cannabis. A positive screen alone cannot convict you, although it allows the police to make an arrest.
At the police station, your blood sample is taken by a doctor or healthcare professional and goes off for laboratory analysis. Ask for part of the sample when it is taken, and the law will require it to be divided, with a part given to you for independent testing. As results can take weeks or even months, many drivers are released while they wait.
If you have been charged or have a blood result showing BZE, speak to Drug Driving Solicitors, who can review your paperwork and explain your options.
7. The DG10 drug-driving conviction and its penalties
Hearings in these cases are held at the magistrates' court. On conviction, the court will impose a mandatory disqualification of at least 12 months, and the conviction also carries 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, the minimum ban increases to three years.
The endorsement code DG10 records the conviction on your licence. It stays on your driving record for 11 years from the date of conviction. Moreover, it is a criminal conviction, not just a motoring matter.
The practical effect can be much higher insurance premiums for years. Anyone who drives for work will find that the employer is able to see the conviction on the licence.
8. What can you do after receiving a charge?
Get specialist advice before your first court hearing. The reason is that early decisions, including how you plead, can affect the outcome. Whether the correct procedures were followed is one thing a solicitor may examine; others are how your blood sample was taken, stored and analysed, and whether the evidence that you were driving is sound.
If drugs were consumed unknowingly, for example through a spiked drink, the court can take it into account when deciding the sentence. Where conviction is a likely result, strong mitigation may still influence the fine and the length of the ban above the minimum. Every case depends on its own facts, so no particular outcome can be guaranteed in advance.
Advice on a benzoylecgonine drug-driving charge from Drug Driving Solicitors
Benzoylecgonine can stay in your blood after cocaine has worn off, and whether or not you felt impaired, a reading above the limit is enough for a charge to be brought. The penalties are serious, but how your case is prepared may affect how things turn out.
If you have been charged, or if you are waiting for blood test results, talk to Drug Driving Solicitors for clear advice on your situation.
This article contains general information about the law in England and Wales; it is not legal advice. Please seek advice on your own circumstances and needs.
Frequently asked questions
Can I go on using my licence before my court hearing?
In most cases, yes. A ban begins when you are sentenced, so being charged does not usually stop you driving. Should the court convict you but delay sentencing, an interim ban can be imposed by it in the meantime.
Is a criminal record certain after a drug-driving conviction?
Yes. Driving above the specified limit is a criminal offence, not just an endorsement on a licence. In addition, the DG10 code stays on your driving record for 11 years from the date of conviction, and employers who check your licence will see it there.
Can a drug-driving ban be reduced by taking a course?
Not at present. Drug driving does not have a national equivalent to the drink-drive rehabilitation course, which can shorten some drink-driving bans.
Would driving over the BZE limit land me in prison?
Imprisonment is possible, but it is an uncommon outcome. In the Sentencing Council guideline, custody is the starting point only in the most serious category: driving commercially or with alcohol or another drug in the blood, for example, combined with poor driving or obvious impairment. When cocaine and BZE are both present, they 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.
