The 8 Things That Matter Most About Benzoylecgonine and Driving in 2026

Published by Drug Driving Solicitors, specialist defence lawyers for drug driving charges across England and Wales

You have a blood test result that mentions benzoylecgonine, and you want to know what it means. In that situation, you are probably facing a drug-driving allegation. Benzoylecgonine is what your body produces when it breaks down cocaine, and in England and Wales it is a criminal offence to drive with too much of it in your blood, even if you felt completely fine.

In the sections that follow, we explain what benzoylecgonine is, what the legal limit is, how police test for it, the penalties you could face and your possible next steps.

1. So, what is benzoylecgonine?

When your body breaks cocaine down, the chemical it produces is benzoylecgonine (BZE), the main metabolite of cocaine. There is no intoxicating effect from BZE itself. Finding it in your blood, though, is strong evidence that cocaine has been used.

In drug-driving cases, the police test for BZE among other substances, because it is so closely linked to cocaine. You might see it called BZE or a cocaine metabolite on paperwork.

2. Detecting benzoylecgonine after cocaine has worn off

Benzoylecgonine is still detectable after the effects of cocaine have passed, since the body clears BZE at a slower rate than cocaine itself. A completely sober feeling is no guarantee against a measurable level.

How much was taken, how often, and your individual metabolism are among the factors that decide how long it remains. Before driving, there is no reliable "safe" waiting time.

3. Is BZE in your blood an offence when you drive?

It is if the level goes above the legal limit. You commit an offence in England and Wales by driving, or attempting to drive, with a specified drug in your blood above its set limit. The offence appears in section 5A of the Road Traffic Act 1988, and it has been in force since 2 March 2015.

Under The Drug Driving (Specified Limits) (England and Wales) Regulations 2014, the drugs covered are listed with their limits. Either reading can lead to a charge, as cocaine and benzoylecgonine are listed separately. Being "in charge" of a vehicle while over the limit, like sitting in a parked car with the keys, counts as a separate offence. It is endorsed as DG40, and the penalties are different.

4. How the benzoylecgonine legal limit is set

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

For illegal drugs such as cocaine, the government's zero-tolerance approach meant setting limits at a level that rules out accidental exposure, not a level linked to impairment. Results from laboratories are reported as "not less than" a figure, allowing for measurement uncertainty. That is why the limit should never be treated as a "safe" amount: a driver could be put over it by any recent cocaine use.

5. Can drug driving lead to conviction without impairment?

It can. The section 5A offence requires the prosecution to prove just that you were driving and that your blood level was above the specified limit. Proof that your driving was affected is not needed.

Under section 4 of the Road Traffic Act 1988, driving while unfit through drugs is a separate offence that does require evidence of impairment. As some drivers are investigated for both, you should check which offence you face.

6. The police tests for cocaine and BZE

At the roadside, the police can use a saliva swab for a preliminary drug test that screens for cocaine and cannabis. A positive screen is not enough by itself to convict you, but it allows the police to arrest you.

At the police station, a blood sample will be taken by a doctor or healthcare professional and sent away for laboratory analysis. If, when it is taken, you ask for part of the sample, the law requires it to be divided and a part to be given to you for independent testing. Results may take weeks or even months, and so many drivers are released while waiting.

If a charge or a blood result showing BZE has reached you, Drug Driving Solicitors can examine your paperwork and explain your options.

7. DG10 drug-driving conviction: the penalties

The magistrates' court is where these cases are heard. A conviction means a mandatory disqualification of at least 12 months, as well as an unlimited fine and up to six months' imprisonment. Any conviction for a relevant drink-driving or drug-driving offence in the previous ten years raises the minimum ban to three years.

On your licence, the conviction is recorded with the endorsement code DG10. That code stays on your driving record for 11 years from the date of conviction, and the conviction is a criminal one, not just a motoring matter.

The practical result can be much higher insurance premiums for years. Your employer will be able to see the conviction on your licence if your job involves driving.

8. What to do if you have been charged

Make sure you get specialist advice ahead of your first court hearing. Early decisions, how you plead among them, can affect the outcome. A solicitor may examine whether the right 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, in deciding the sentence, that drugs were consumed unknowingly, perhaps through a spiked drink. Even where a conviction is likely, the fine and the length of the ban above the minimum may still be influenced by strong mitigation. Each case depends on its own facts, so a particular outcome can never be guaranteed.

Need advice on a benzoylecgonine drug-driving charge?

Benzoylecgonine may stay in your blood after cocaine has worn off, and a charge can follow from a reading above the limit whether or not you felt impaired. The penalties are serious, but the way your case is prepared may affect the outcome.

For clear advice on your situation, speak to Drug Driving Solicitors if you have been charged or are awaiting blood test results.

This article is general information on the law in England and Wales and is not legal advice. Please seek advice about your own circumstances.

Frequently asked questions

Will I be able to drive before my court hearing?

In most cases, you will. Because a ban starts when you are sentenced, being charged does not usually stop you driving. The court can impose an interim ban in the meantime if it convicts you and then delays sentencing.

Does a drug-driving conviction result in a criminal record?

Yes. Rather than just an endorsement, driving above the specified limit is a criminal offence. The DG10 code stays on your driving record for 11 years from the date of conviction as well, and any employer who checks your licence will see it.

Can a course help reduce a drug-driving ban?

Not currently. There is a drink-drive rehabilitation course that can shorten some drink-driving bans, but it has no national equivalent for drug driving.

Could I be jailed for driving over the BZE limit?

Prison is possible, although it is uncommon. According to the Sentencing Council guideline, custody is the starting point in the most serious category only, for example driving commercially or with alcohol or another drug in the blood, combined with poor driving or obvious impairment. Where cocaine and BZE are found together, they count 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.