What the Law Says on 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

Perhaps your blood test result mentions benzoylecgonine and you are trying to work out what it means. If so, you are probably facing a drug-driving allegation. The body produces benzoylecgonine when it breaks down cocaine. Under the law of England and Wales, it is a criminal offence to drive with too much of it in your blood, and feeling completely fine does not change that.

Over the next eight sections, we cover what benzoylecgonine is, the legal limit, police testing methods, the penalties you could face and what you can do next.

1. Benzoylecgonine in plain terms

Benzoylecgonine (BZE) is what is called the main metabolite of cocaine. The phrase simply means the chemical your body produces as it breaks cocaine down. It carries no intoxicating effect of its own, but finding it in someone's blood is strong evidence that cocaine has been used.

Its close link with cocaine makes BZE one of the substances tested for by police in drug-driving cases. On paperwork, you may see either BZE or a cocaine metabolite.

2. Benzoylecgonine detection once cocaine has worn off

How can benzoylecgonine show up after the effects of cocaine are gone? The answer is that the body clears BZE more slowly than cocaine itself. Feeling completely sober and having a measurable level can happen at the same time.

Your individual metabolism, how much was taken and how often all play a part in how long it remains. Before you drive, there is no reliable "safe" waiting time to rely on.

3. The offence of driving with BZE in your blood

Driving with BZE in your blood is an offence when the level is above the legal limit. In England and Wales, the law makes it an offence to drive, or attempt to drive, with a specified drug in your blood over its set limit. The offence came into force on 2 March 2015 and sits within section 5A of the Road Traffic Act 1988.

It is The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 that list the drugs covered and their limits. With cocaine and benzoylecgonine listed separately, either reading may lead to a charge. Separately, being "in charge" of a vehicle while over the limit is its own offence, endorsed as DG40 and carrying different penalties. Sitting in a parked car with the keys would be an example.

4. The benzoylecgonine legal limit, explained

At 50 micrograms per litre of blood (µg/L), the benzoylecgonine legal limit applies to drivers across England and Wales. The limit for cocaine itself is lower, set at 10 µg/L.

For cocaine and other illegal drugs, the government's approach was zero-tolerance: limits were placed at a level that rules out accidental exposure, rather than at a level linked to impairment. To allow for measurement uncertainty, a laboratory reports results as "not less than" a figure. As a result, the limit should never be treated as a "safe" amount, given that any recent cocaine use may put a driver above it.

5. Drug-driving conviction without impairment: can it happen?

It can. For the section 5A offence, there are only two things the prosecution needs to prove: you were driving, and your blood level exceeded the specified limit. Showing that your driving was affected is unnecessary.

Driving while unfit through drugs, a separate offence under section 4 of the Road Traffic Act 1988, works differently because it requires evidence of impairment. With some drivers investigated for both, you should check which offence applies.

6. Testing for cocaine and BZE by the police

The police can conduct a roadside preliminary drug test with a saliva swab that screens for cocaine and cannabis. On its own, a positive screen cannot convict you. What it does is allow the police to arrest you.

Later, at the police station, a doctor or healthcare professional takes a blood sample, which goes away for laboratory analysis. If you request part of the sample at the time it is taken, the law requires the sample to be divided, and you must be given a part for independent testing. Results can take weeks or even months, so many drivers are released while waiting for the result.

Facing a charge or a blood result that shows BZE? Our team at Drug Driving Solicitors can review your paperwork and explain your options.

7. DG10 drug-driving conviction penalties you could face

These cases are heard by the magistrates' court. A conviction results in a mandatory disqualification of at least 12 months, plus an unlimited fine and up to six months' imprisonment. Should you have been convicted of a relevant drink-driving or drug-driving offence in the ten years beforehand, the minimum ban rises to three years.

Your licence will show the endorsement code DG10, and it stays on your driving record for 11 years from the date of conviction. As well as a motoring matter, it is a criminal conviction.

Practically speaking, you may see much higher insurance premiums for years. Where you drive for work, your employer will be able to see the conviction on your licence.

8. Options available once you have been charged

It is best to obtain specialist advice before your first court hearing, because early decisions, such as how you plead, can affect the outcome. A solicitor may look into 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.

If drugs were consumed unknowingly, through a spiked drink for instance, this can be taken into account by the court when it decides the sentence. Where conviction is likely, strong mitigation may still influence the length of the ban above the minimum, as well as the fine. Each case depends on its own facts, so a particular outcome cannot be guaranteed.

Talk to us about a benzoylecgonine drug-driving charge

Benzoylecgonine has the potential to stay in your blood after cocaine wears off, and a reading above the limit is enough for a charge whether or not you felt any impairment. The penalties are serious, yet the outcome may be affected by the preparation of your case.

If you are waiting for blood test results or have been charged, speak to Drug Driving Solicitors for clear advice on where you stand.

This article is intended as general information about the law in England and Wales and is not legal advice. Advice on your own circumstances should be sought.

Frequently asked questions

Do I have to stop driving before my court hearing?

In most cases, no, you can keep driving. A ban starts when you are sentenced, which is why being charged does not usually stop you driving. If the court convicts you but holds off on sentencing, it can impose an interim ban in the meantime.

Will a criminal record follow a drug-driving conviction?

Yes. Driving above the specified limit is a criminal offence, so it is not just an endorsement. Furthermore, the DG10 code stays on your driving record for 11 years from the date of conviction, and employers checking your licence will see it.

Is it possible to reduce a drug-driving ban with a course?

Not at present. Some drink-driving bans can be shortened by the drink-drive rehabilitation course, though there is no national equivalent for drug driving.

Can driving over the BZE limit put me in prison?

A prison sentence is possible, though uncommon. The Sentencing Council guideline sets custody as the starting point only in the most serious category: examples include driving commercially or with alcohol or another drug in the blood, combined with poor driving or obvious impairment. Cocaine and BZE found together are counted 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.