What happens if the police stop you with prescribed cannabis?

Possession of a lawfully prescribed controlled drug is not an offence. That is the law. The practical difficulty is that you may be the first prescribed patient a particular officer has encountered, and the smell is the same as the smell they are trained to act on.

Why possession is lawful

Cannabis is a Class B controlled drug, and possession is an offence under the Misuse of Drugs Act 1971. The Misuse of Drugs Regulations 2001 then create the exception: a person may lawfully possess a controlled drug that has been supplied to them on a prescription.

Since November 2018, cannabis-based products for medicinal use have sat in Schedule 2 of those Regulations, which is what makes a specialist prescription possible at all. The background is set out in Is medical cannabis legal in the UK?

What the law does not do is make you look any different from someone in unlawful possession. That gap between the legal position and the practical situation is what this page is about.

What to carry

The single most useful thing is the original dispensed container with the pharmacy label intact. It is the document police are most used to reading and it answers the question directly.

• The original dispensed packaging, with the pharmacy label showing your name
• A copy of your prescriber's letter if you have one, on clinic letterhead
• The clinic's contact details, so an officer can verify if they wish
• Only the quantity you reasonably need for the time you are out

Some patients also carry the Cannabis Industry Council's guidance for police, a short document written with solicitors and aimed at officers. It sets out that possession and public use of a prescribed cannabis medicine is lawful, and that a prescription or dispensing label together with photo ID is enough to establish it. Handing it over is not a magic word, but it gives an officer who has not met a prescribed patient before something to read.

Decanting your medicine into a different container removes the one piece of evidence that makes the conversation short. Keep it in what the pharmacy gave you.

If you are stopped

Calm cooperation resolves almost all of these encounters. The officer is trying to establish whether an offence is being committed, and you have the evidence that shows it is not.

1. Say clearly and early that you have a prescription for a controlled drug and that you are happy to show it.
2. Tell the officer where it is before reaching for it.
3. Hand over the dispensed container and let them read the label.
4. If they want to verify, offer the clinic's contact details.
5. If a search happens anyway, you can ask for the officer's name, station and the grounds for the search, and you are entitled to a record of it.

You are not obliged to explain your medical condition, and an officer does not need your diagnosis to establish lawful possession — the label does that. If a stop goes badly, note the details, keep the paperwork, and take it up through the force's complaints process or with a solicitor afterwards rather than at the roadside.

If you were driving, the separate question of drug driving applies, and that is covered in Can you drive on a medical cannabis prescription?

What a prescription does not cover

The exception in the Regulations covers the drug supplied to you, for you. It does not stretch further than that.

• Giving or selling any of it to another person is supply, which is a serious offence, regardless of who they are or why
• Possessing someone else's prescribed medicine is not covered
• Growing your own is not covered under any circumstances
• Buying illicitly to top up a prescription is straightforwardly unlawful

Some public places — certain workplaces, licensed premises, hospital grounds and some transport settings — have their own rules on use that are separate from the criminal law. A prescription does not override a landowner's policy.

Using your medicine when you are out

Possession is only half the question; people also ask where they can actually take their medicine. Use of a prescribed cannabis medicine is lawful for the patient it was prescribed to, but that is not the same as being able to use it anywhere.

Private venues, employers, transport operators and hospital grounds all set their own rules about where medicines may be used on their premises, and a prescription does not override a landowner's policy. Vaping or smoking may be restricted in the same way it is for anyone else, and on the clinical side smoking any cannabis is not advised. In practice, discretion and the dispensing label solve most situations: take your medicine as your specialist has directed, keep it in its original packaging, and be ready to explain it calmly if asked.

If you are behind the wheel, a separate set of rules applies whatever the setting, and that is dealt with in can you drive on a medical cannabis prescription?

If a stop goes wrong

Most encounters end once the label is seen, but not all do. If a stop escalates despite valid paperwork, the aim shifts from resolving it there to protecting your position for afterwards.

1. Comply at the scene. Arguing the law at the roadside rarely helps and can make things worse.
2. Note the details — the officer's name, number and station, and the time and place.
3. Ask for a record of the search and the grounds for it, which you are entitled to.
4. Keep every document, including the dispensing label and any prescriber's letter.
5. Follow it up through the force's professional standards department, or the Independent Office for Police Conduct, and a solicitor if it escalates.

None of this is common, and it is not a reason to be anxious about carrying your medicine. It is simply the sensible fallback for the rare occasion when a calm explanation is not enough on its own.

One caveat before you rely on any of this

This is general information about how the rules on police powers and controlled drugs work, not legal advice, and it cannot take account of your circumstances.

The law changes, enforcement practice varies, and the details of your own case matter. If something here could affect your licence, your job or your liberty, get advice from someone qualified to give it — a solicitor, your prescriber, or the relevant authority itself. Where we can point you at the primary source, we have.

Patient guide · Written by the Flora House editorial team · Last reviewed: 2 November 2026