Is it illegal to drive with medical cannabis in your system in Australia?

In most states and territories, yes, if your medicine contains THC. It is an offence to drive with any detectable THC, prescribed or not. Tasmania has a medical defence, Victoria allows court discretion on licence loss, and NSW has passed a registration scheme that has not started yet.

Can I drive if I only take CBD oil?

A CBD-only medicine with no THC should not trigger a roadside THC presence offence. Impaired-driving laws still apply, and CBD can cause drowsiness in some people. Ask your pharmacist to confirm your product contains no THC, and talk to your doctor before driving.

When does the NSW medicinal cannabis driving scheme start?

The law was assented to on 23 September 2026. The NSW Government says the registry and education module are expected to launch in late 2026 or early 2027. Until then, it remains an offence in NSW to drive with THC in your system, even with a prescription.

Does a prescription protect me in Victoria?

Not completely. Driving with THC is still an offence. Since 1 March 2025, a magistrate can decide not to cancel your licence if it is a first offence, you held a valid prescription, took it as prescribed and were not impaired. There is no guarantee you will keep your licence.

How long after taking medical cannabis can THC be detected?

There is no single answer. THC can remain detectable after its effects wear off, and the window varies with the person, product, dose and type of test. Official sources do not give a safe waiting time, so ask your doctor and follow the law where you drive.

Does Tasmania's medical defence cover interstate prescriptions?

It is unclear. A 2024 Magistrates Court decision rejected the defence for a prescription from an interstate doctor. Since 16 February 2026, Tasmanian pharmacists can dispense interstate prescriptions for medicinal cannabis, but we found no court ruling on the driving defence since then. Get legal advice.

Can I be charged with drug driving if I am not impaired?

Yes, in most of Australia. Presence offences only require a positive test for THC, so police do not need to prove your driving was affected. Separately, driving while impaired by any drug, including a prescribed medicine, is an offence in every state and territory.

Can You Drive on Medical Cannabis in Australia? State-by-State Guide (2026)

By Medicated TV · by the patient, for the patients · Reviewed 28 September 2026

Quick answerIn most of Australia it is an offence to drive with any detectable tetrahydrocannabinol (THC), even with a valid prescription. Tasmania has a medical defence for lawful use, Victoria lets magistrates decide on licence loss, and NSW has passed a registration scheme expected to start late 2026 or early 2027.

If you are a medical cannabis patient, driving is one of the first practical questions after your first script. The answer depends on where you live, what your medicine contains and whether you are impaired. This guide sets out the rules in every state and territory as at 28 September 2026.

From the patient side (Medicated TV founder Irish Wick went through the early "trial days" of legal access, including prescription nasal sprays), we focus on what the law actually says, not what people assume it says.

Can you drive on medical cannabis in Australia?

Only in limited cases. Every state and territory runs roadside tests that detect tetrahydrocannabinol (THC), and in most places any detectable THC is an offence, prescription or not. Tasmania has a medical defence, Victoria gives magistrates discretion, and a new NSW patient scheme is due to start soon.

THC is the intoxicating compound in cannabis. Cannabidiol (CBD) is the non-intoxicating one. Roadside tests look for THC, so a medicine that contains only CBD should not trigger a THC presence offence. Impaired-driving laws still apply to every medicine, including CBD.

What is the difference between presence and impairment offences?

A presence offence only needs a test to find THC in your saliva or blood. Police do not have to prove your driving was affected. An impairment offence means driving while under the influence of a drug, and it applies to all drugs, including prescribed medicines and CBD.

Presence: based on a positive saliva or blood test. No proof of poor driving is needed.
Impairment: police must show a drug affected your ability to control the vehicle. It is a serious offence everywhere in Australia.
Why it matters: THC can stay detectable after its effects wear off. How long varies with the person, the product and the test, so "I feel fine" is not a defence to a presence offence.

This gap is the heart of the patient debate. Other prescribed medicines that can affect driving, such as opioids, are dealt with under impairment laws. In most states, prescribed THC is treated the same as illicit cannabis.

What happens at a roadside drug test?

Police ask for a saliva sample, usually by wiping a test strip on your tongue.
If the screen detects THC, the result is normally confirmed by further testing, often in a laboratory.
You are banned from driving on the spot, for example for 24 hours in Queensland and at least 12 hours in Victoria.
If THC is confirmed, you may receive a penalty notice or a court date, with a fine and licence suspension or disqualification.

Can you drive on medical cannabis in Tasmania?

Tasmania is the only jurisdiction with a medical defence in force. Under section 6A(2) of the Road Safety (Alcohol and Drugs) Act 1970, you do not commit the THC presence offence if the drug was obtained and administered in line with the Poisons Act 1971. Impaired driving remains illegal.

Tasmania's Department of Health still warns that medicinal cannabis can affect fitness to drive. Two points matter for patients with interstate prescribers:

In a 2024 decision (Smith v Marshall), a Tasmanian magistrate rejected the defence where the prescription came from an interstate doctor.
From 16 February 2026, new Tasmanian rules let pharmacists dispense interstate prescriptions for medicines including medicinal cannabis.
We found no court ruling on how that reform affects the driving defence. If your script is from interstate, get legal advice before relying on it.

What changed for medical cannabis drivers in Victoria?

Since 1 March 2025, Victorian magistrates can decide whether to cancel the licence of a prescribed patient caught with THC, instead of loss being automatic. Driving with any THC is still an offence. The discretion only applies if you were unimpaired and met strict conditions.

The change came through the Roads and Road Safety Legislation Amendment Act 2024. According to Transport Victoria, the discretion is only available when:

it is a first offence;
you held a valid prescription at the time;
the product was legal and taken as prescribed;
you were not impaired; and
no other drugs were involved.

Because the discretion sits with a magistrate, it only comes into play if your matter goes to court, and it does not guarantee you keep your licence. At the roadside you will still be told not to drive for at least 12 hours.

Victoria also funded a closed-track driving trial run by Swinburne University, announced in May 2024, with testing from November 2024. At the Government's April 2026 update, testing of control participants was still under way and results had not been published.

Can you drive on medical cannabis in NSW?

Not yet with THC in your system. NSW passed the Road Transport Legislation Amendment (Medical Cannabis and Driving Offences) Act 2026, assented on 23 September 2026. It creates a registration scheme for eligible patients, but the Government expects it to start in late 2026 or early 2027.

Until then, Transport for NSW says it remains an offence to drive after taking THC, whatever the source. Once running, the scheme is expected to work like this:

Register with Transport for NSW and provide evidence of a valid prescription.
Complete a mandatory online education module.
Hold an unrestricted NSW licence. Learner, P-plate and commercial drivers are excluded.
If a roadside test is positive, you get a 24-hour driving ban while a laboratory tests the sample.
Below 50 nanograms of THC per millilitre (ng/mL): no further action. At or above it: a warning for a first or second detection within two years, then a fine and at least a three-month suspension for a third.

The scheme does not cover drug-impaired driving, or cases where alcohol or other illicit drugs are detected. The Government has committed to a review after one year.

Can you drive on medical cannabis in Queensland?

No. Queensland Police state it is an offence to drive with THC in your system even if it is prescribed. A positive roadside test brings a 24-hour licence suspension. Laws passed in September 2026 double drug-driving penalties from 1 December 2026, with no medical exemption.

The Government kept its zero-tolerance approach on the basis that there is no scientifically reliable THC impairment threshold or roadside impairment test.

What are the rules in SA, WA, the NT and the ACT?

All four use presence-based THC testing with no medical defence. Parliamentary committees in South Australia (2024) and Western Australia (2023) recommended changes for unimpaired patients, and an ACT Greens bill was introduced in June 2026, but we found no change to the law in any of them.

South Australia: police test for THC, methylamphetamine, MDMA (ecstasy) and, since May 2025, cocaine. Any amount is an offence. In September 2024 the Joint Committee on the Legalisation of Medicinal Cannabis recommended amending the Road Traffic Act so prescribed, unimpaired patients with zero blood alcohol could drive. In October 2025 the Government said it would wait for the committee's final report.
Western Australia: WA Health says driving with THC is an offence whether it is prescribed or illicit. The Select Committee on Cannabis and Hemp recommended reform in March 2023, and the Government set up a working group later that year.
Northern Territory: drug driving is presence-based and we found no medicinal cannabis exemption.
Australian Capital Territory: in a March 2026 response to a petition, the ACT Government said any THC detection leads to licence suspension, no defence exists for patients, and presence-based offences remain appropriate. Greens member Andrew Braddock introduced a bill in June 2026 to create a defence for unimpaired patients.

How do the drug-driving rules compare by state?

Every jurisdiction tests drivers for THC. Only Tasmania currently offers a medical defence. Victoria offers court discretion on licence loss, and the NSW registration scheme is law but not yet running. Everywhere, driving while impaired by any drug, prescribed or not, remains a serious offence.

State or territory	Roadside THC test	Medical defence	Notes (September 2026)
New South Wales	Yes	Not yet	Registration scheme passed in September 2026; expected to start late 2026 to early 2027. Unrestricted licences only.
Victoria	Yes	No (court discretion)	Since 1 March 2025, magistrates can decide on licence cancellation for unimpaired, first-offence patients.
Queensland	Yes	No	Higher drug-driving penalties from 1 December 2026; no exemption.
South Australia	Yes	No	2024 committee recommended a defence; no law change found.
Western Australia	Yes	No	2023 committee recommended reform; no law change found.
Tasmania	Yes	Yes	Defence if obtained and administered under the Poisons Act 1971. Position of interstate scripts unclear.
Australian Capital Territory	Yes	No	Government declined change in March 2026; Greens bill introduced June 2026.
Northern Territory	Yes	No	Presence-based; no exemption found.

What should medical cannabis patients do before driving?

Know what is in your medicine, know your state's law and talk to your doctor about fitness to drive. If your product contains THC and you are outside Tasmania, the safest legal choice is not to drive while THC could still be detectable in your system.

Ask your pharmacist whether your product contains THC or is CBD-only.
Ask your doctor how your medicine and dose may affect your driving, especially when starting or changing products.
Never drive if you feel drowsy, slowed or "off". Impaired driving is illegal everywhere.
Never combine your medicine with alcohol or other drugs before driving.
Keep your prescription details handy. They matter if you are tested in Tasmania or Victoria.
In NSW, watch for the Transport for NSW registration launch and complete the education module.
If you are charged, get legal advice before paying a fine or entering a plea.

What do patients wish they had known?

CBD-only must mean no THC. Check the label and confirm with your pharmacist.
Feeling fine is not a defence to a presence offence outside Tasmania.
Rules change at the border. A Tasmanian defence does not travel with you to Victoria or NSW.
Passed is not the same as in force. The NSW scheme is law but not yet operating.
Only prescribed use is covered. No reform protects illicit cannabis.

What do the key terms mean?

Presence offence: driving with any detectable amount of a tested drug.
Medical defence: a legal answer to a presence charge if you used the drug lawfully under a prescription.
ng/mL: nanograms per millilitre, a measure of how much THC is in a sample.
Unrestricted licence: a full licence, not a learner, provisional or commercial one.

This guide is general information only, not medical or legal advice. Talk to your doctor or pharmacist about your medicine, and to a lawyer or police about the law where you drive.

Sources

General information only, not medical or legal advice. Medicinal cannabis is a prescription medicine in Australia — talk to your doctor or pharmacist about your own situation.