From Metabolite to Conviction: 8 Things to Know About Benzoylecgonine and Driving in 2026
Published by Drug Driving Solicitors, specialist defence lawyers for drug driving charges across England and Wales
So your blood test result refers to benzoylecgonine, and you want to know what it means. The likelihood is that you are facing a drug-driving allegation. Benzoylecgonine comes from the body breaking down cocaine. Under the law of England and Wales, having too much of it in your blood while driving is a criminal offence, even if you felt completely fine at the wheel.
This article sets out what benzoylecgonine is, the legal limit, how police test for it, the penalties you could face, and what you can do next.
1. Benzoylecgonine: where it comes from
Breaking cocaine down causes your body to produce a chemical called benzoylecgonine (BZE), the main metabolite of cocaine. There is no intoxicating effect from BZE alone. Nevertheless, once found in your blood, it serves as strong evidence that cocaine has been used.
Police test for BZE in drug-driving cases because it is linked so closely with cocaine. You may see it named on paperwork as BZE, or else as a cocaine metabolite.
2. Why benzoylecgonine can be traced after the effects of cocaine wear off
Your body clears benzoylecgonine more slowly than it clears cocaine. For that reason, BZE can be detected even after the effects of cocaine have worn off. It is possible to feel completely sober and still have a measurable level in your blood.
Factors including how much was taken, how often, and your individual metabolism will affect how long it remains. Before driving, there is no reliable "safe" waiting time anyone can count on.
3. Does driving with BZE in your blood break the law?
Yes, if the level is over the legal limit. It is an offence in England and Wales to drive, or try to drive, with a specified drug in your blood above its set limit. The offence is located in section 5A of the Road Traffic Act 1988 and came into force on 2 March 2015.
Drugs covered by the offence, along with their limits, are listed in The Drug Driving (Specified Limits) (England and Wales) Regulations 2014. A reading for either cocaine or benzoylecgonine can lead to a charge, because each is listed separately. Being "in charge" of a vehicle while over the limit, for example by sitting in a parked car with the keys, is a different and separate offence. It is endorsed as DG40, with penalties that differ.
4. What benzoylecgonine legal limit applies to drivers?
Drivers in England and Wales are bound by a benzoylecgonine legal limit of 50 micrograms per litre of blood (µg/L). The limit set for cocaine itself is lower, at 10 µg/L.
Adopting a zero-tolerance approach for illegal drugs such as cocaine, the government chose limits at a level that rules out accidental exposure rather than a level linked to impairment. Each laboratory result is reported as "not less than" a figure, which allows for measurement uncertainty. The limit should not, therefore, ever be treated as a "safe" amount, as any recent cocaine use may put a driver over it.
5. Is conviction for drug driving possible where there was no impairment?
Yes, it is. To prove the section 5A offence, it is sufficient for the prosecution to establish that you were driving and that your blood level exceeded the specified limit. Evidence that your driving was affected is not needed.
That is not the case with driving while unfit through drugs, a separate offence under section 4 of the Road Traffic Act 1988 that requires evidence of impairment. Since some drivers face investigation for both offences, it is wise to check which offence you face.
6. Police testing for BZE and cocaine: how it works
A roadside preliminary drug test can be carried out by police, who use a saliva swab to screen for cocaine and cannabis. The police can arrest you following a positive screen, but that screen alone cannot convict you.
At the police station, a blood sample is taken by a doctor or a healthcare professional and is sent for laboratory analysis. The law requires the sample to be divided if you ask for part of it when it is taken, and a part must then be given to you for independent testing. Since results can take weeks or even months, many drivers are released until the result arrives.
Has a charge or a blood result showing BZE come your way? Drug Driving Solicitors can review your paperwork and explain your options in full.
7. What penalties can a DG10 drug-driving conviction lead to?
These cases come before the magistrates' court. A conviction carries a mandatory disqualification of at least 12 months, as well as an unlimited fine and up to six months' imprisonment. For drivers previously convicted of a relevant drink-driving or drug-driving offence in the ten years before this one, the minimum ban rises to three years.
The conviction is entered on your licence with endorsement code DG10, and it remains on your driving record for 11 years from the date of conviction. It is a criminal conviction in addition to being a motoring matter.
In practice, insurance premiums can rise much higher and stay that way for years. If you drive for work, your employer will be able to see the conviction listed on your licence.
8. What can be done after you have been charged?
It is important to get specialist advice before your first court hearing, as early decisions, including the plea you make, can affect the outcome. A solicitor may examine whether correct procedures were followed, how your blood sample was taken, stored and analysed, and whether the evidence of your driving is sound.
Where drugs were consumed unknowingly, through a spiked drink for example, the court can take that into account as it decides the sentence. Even with a conviction likely, strong mitigation may still influence the fine and how long the ban lasts beyond the minimum. Because the facts of every case are its own, no particular outcome can be guaranteed.
Getting advice on a benzoylecgonine drug-driving charge quickly
Benzoylecgonine can stay in your blood even after cocaine has worn off, and a reading above the limit is enough for a charge, whether or not you felt impaired at all. The penalties are serious, but how your case is prepared may affect the end result.
Speak to Drug Driving Solicitors for clear advice on your situation if you are waiting for blood test results or have already received a charge.
This article is general information on the law in England and Wales and should not be read as legal advice. Do seek advice on your own circumstances.
Frequently asked questions
Can I continue driving until my court hearing takes place?
In most cases, yes. Being charged does not usually stop you driving, because a ban only starts when you are sentenced. If the court convicts you but delays sentencing, the court can impose an interim ban for that period.
Will a conviction for drug driving give me a criminal record?
Yes. Driving above the specified limit is a criminal offence, and therefore not just an endorsement. The DG10 code also stays on your driving record for 11 years from the date of conviction, and employers that check your licence will see it.
Can a drug-driving ban be cut short by a course?
Not at present. While the drink-drive rehabilitation course can shorten some drink-driving bans, a national equivalent for drug driving does not exist.
Is jail a possibility for driving over the BZE limit?
Prison is possible, but it remains uncommon. Under the Sentencing Council guideline, custody is the starting point only in the most serious category, for example driving commercially or with alcohol or another drug in the blood, when combined with poor driving or obvious impairment. Cocaine and BZE found together count as one drug for the purposes of this guideline.
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.