Alternative Medicine and Driving Laws in Australia (2026)
Last Updated: 22 May 2026
Alternative medicine is legally prescribed to thousands of Australians, but driving laws are still catching up. In most states and territories, drivers can be penalised if THC is detected in their system, even if they have a valid prescription and do not appear impaired.
This has created a growing national debate about whether Australian drug-driving laws should focus on impairment, rather than simply detecting the presence of THC.
The Key Issue: THC Detection vs Impairment
Roadside drug tests generally detect the presence of THC, the main psychoactive compound in cannabis. However, THC can remain detectable after the effects of cannabis have worn off. This means a medicinal cannabis patient may test positive even if they are not impaired at the time of driving.
Driving while impaired is illegal in every Australian state and territory. The legal debate is about whether unimpaired patients using prescribed medicinal cannabis should lose their licence simply because THC is detected.
NSW: Reform Is Active in Parliament
New South Wales is currently one of the most important states to watch for medicinal cannabis driving reform. Under current NSW law, it remains an offence to drive with THC present in oral fluid, blood or urine, even if the THC came from legally prescribed medicinal cannabis.
What is happening in NSW Parliament?
There are two major reform developments:
-
Road Transport Amendment (Medicinal Cannabis) Bill 2025: Introduced by Independent MP Alex Greenwich in November 2025. The bill aimed to limit when drug-driving offences apply to medicinal cannabis patients. NSW Parliament records show this bill was withdrawn on 14 May 2026.
- Road Transport Amendment (Medicinal Cannabis—Exemptions from Offences) Bill 2025: Introduced by Greens MP Cate Faehrmann. NSW Parliament records show this bill remains in the Legislative Council, with debate adjourned after its second reading stage.
The NSW Government has also publicly signalled that it is reviewing the issue and may bring forward its own legislation. At the time of writing, no final government bill has passed.
Status: Reform active. One bill withdrawn, one bill still before parliament, and government reform may follow.
Victoria: Reform Has Already Passed
Victoria has already introduced one of Australia’s most important medicinal cannabis driving reforms. Drivers using prescribed medicinal cannabis can still be charged if THC is detected, but courts now have discretion not to automatically cancel a licence where the person had a valid prescription and was not impaired.
This does not mean patients can freely drive after using cannabis. Driving while impaired remains illegal. However, Victoria now gives magistrates more flexibility when dealing with medicinal cannabis patients.
Victoria has also been running a medicinal cannabis driving trial to better understand impairment, road safety and THC detection.
Status: Reform passed. Victoria is now ahead of most states, but it is not a full legal defence.
Queensland: Review Underway, Pressure Increasing
Queensland currently has strict drug-driving laws. Medicinal cannabis patients can still face penalties if THC is detected, even when they have a prescription.
The Queensland Government has been reviewing its drug-driving program, including how cannabis and medicinal cannabis are treated under road laws. Legal experts, patient advocates and former magistrates have called for a medical defence for patients who are not impaired.
At the time of writing, Queensland has not passed a medicinal cannabis driving defence, and no final reform has been confirmed.
Status: Under review. No confirmed bill passed yet.
Tasmania: The Most Patient-Friendly Current Law
Tasmania remains the most progressive Australian jurisdiction for medicinal cannabis and driving. Tasmania allows a defence for patients who have lawfully used prescribed medicinal cannabis, provided they are not impaired while driving.
This makes Tasmania the state most often used as an example by reform advocates in other parts of Australia.
Status: Defence already exists. Driving while impaired remains illegal.
South Australia: Parliament Committee Recommended Reform
South Australia has not yet passed a full medicinal cannabis driving defence, but reform has been formally considered through parliament.
A South Australian parliamentary committee recommended changes to the Road Traffic Act so that it would not be an offence for a prescribed medicinal cannabis patient to drive with THC in their system, provided they are not impaired.
At the time of writing, this appears to be a parliamentary recommendation rather than a law that has already passed.
Status: Reform recommended by committee. Not yet confirmed as passed law.
Western Australia: Working Group and Political Pressure
Western Australia still has strict THC driving laws, and medicinal cannabis patients can be penalised if THC is detected.
A WA medicinal cannabis and safe driving working group has been considering evidence and potential reform. Legalise Cannabis WA has continued to campaign for changes, arguing that patients should not be punished when they are using prescribed medicine and are not impaired.
WA also has broader cannabis law reform activity, but at the time of writing, medicinal cannabis driving reform has not yet passed.
Status: Working group/reform discussion active. No patient driving defence passed yet.
ACT: Reform Has Been Raised, But No Clear Bill Passed
The ACT has considered questions about whether its laws should be brought closer to Victoria’s approach. In 2025, ACT parliamentary questions specifically asked whether medicinal cannabis users should avoid automatic disqualification where THC is detected but impairment is not proven.
At the time of writing, there does not appear to be a passed ACT medicinal cannabis driving defence.
Status: Issue raised in parliament. No confirmed law passed.
Northern Territory: No Major Reform Confirmed
In the Northern Territory, medicinal cannabis can be prescribed, but drug-driving laws remain strict. Driving under the influence of cannabis or medicinal cannabis is illegal.
At the time of writing, there does not appear to be a major NT medicinal cannabis driving reform bill before parliament.
Status: No confirmed medicinal cannabis driving reform bill found.
State-by-State Summary
| State/Territory | Current Position | Reform Status |
|---|---|---|
| NSW | THC presence can still trigger penalties, even with a prescription. | Active reform. One bill withdrawn; another remains before parliament. |
| Victoria | THC presence remains an offence, but courts have discretion for prescribed, unimpaired patients. | Reform passed. |
| Queensland | Strict THC detection laws still apply. | Government review and public pressure, but no passed reform yet. |
| Tasmania | Medicinal cannabis defence available if lawful use and no impairment. | Defence already exists. |
| South Australia | Strict THC detection laws still apply. | Parliamentary committee recommended reform. |
| Western Australia | Strict THC detection laws still apply. | Working group and political pressure, but no passed defence yet. |
| ACT | Strict drug-driving laws still apply. | Issue raised in parliament; no confirmed passed reform. |
| Northern Territory | Driving under the influence of cannabis or medicinal cannabis remains illegal. | No confirmed reform bill found. |
What Medicinal Cannabis Patients Should Know
- Driving while impaired is illegal everywhere in Australia.
- A medicinal cannabis prescription does not automatically protect patients in most states.
- THC may remain detectable after impairment has passed.
- Laws are different depending on the state or territory.
- Patients should seek legal advice if they are charged with a drug-driving offence.
- Patients should follow their doctor’s advice and avoid driving if they feel impaired.
Final Thoughts
Medicinal cannabis driving laws in Australia are changing, but reform is uneven. NSW is now the major state to watch, with active parliamentary reform and government attention. Victoria has already taken a major step by giving courts more discretion. Tasmania remains the strongest example of a medical defence model, while Queensland, South Australia and Western Australia are facing increasing pressure to modernise their laws.
For patients, the safest message is simple: do not drive while impaired, understand your local laws, and do not assume that a prescription protects you from THC driving penalties.
