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Medicinal Cannabis & Driving in SA: Law & Reform Status (2026)
Strict presence offence — parliamentary committee has recommended reform Last verified:
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- : Verification sweep: legal position checked against legislation, official guidance and practitioner sources; figures current as at July 2026.
SA's official driver guidance states police conduct random roadside saliva tests for THC, methylamphetamine, cocaine and MDMA, and — unlike drink driving's concentration thresholds — the presence of any amount of these drugs is an offence. Refusing or failing to comply with drug testing is itself an offence, can mean immediate loss of licence at the roadside, and carries disqualification of at least 12 months on conviction. A parliamentary committee has recommended amending the Road Traffic Act so unimpaired prescribed patients would not commit an offence, but this is a recommendation only — not passed law.
Just tested positive? What happens next in South Australia, step by step →
Medicinal cannabis and driving in SA: where the law stands
South Australia's official driver guidance is blunt: police conduct random roadside saliva tests for THC, methylamphetamine, cocaine and MDMA, and — unlike drink driving, where a prescribed alcohol concentration must be reached — the presence of any amount of these drugs is an offence. A prescription does not change that under current law.
Refusing or failing to comply with a drug screening test, oral fluid analysis or blood test is itself an offence, can mean immediate loss of licence at the roadside, and carries disqualification for at least 12 months on conviction.
What a first offence costs: SA offers an expiation pathway — $875 (as at 1 July 2025) with a 3-month licence disqualification. Prosecuted at court instead: a fine of $900–$1,300 and mandatory disqualification of at least 6 months. Expiation avoids a conviction; court doesn't necessarily.
Reform status: a committee says change it — Parliament hasn't yet
The Joint Committee on the Legalisation of Medicinal Cannabis tabled its interim report on 25 September 2024. Recommendation 1 calls on the Minister for Infrastructure and Transport to draft Road Traffic Act amendments so that it would not be an offence for a prescribed medicinal cannabis patient to drive with THC present, provided the medicine is used in accordance with the prescription — explicitly the Tasmanian model — with community consultation on the draft. This is a recommendation, not law: as at July 2026 no government response or amending bill has been identified. Follow it on our Reform Tracker.
FAQ (render with FAQPage schema)
Does any amount of THC really count in SA? Yes — SA's official guidance states presence of any amount of the tested drugs is an offence, with no minimum threshold.
Didn't SA recommend fixing this? A parliamentary committee recommended an unimpaired-patient exemption, but a recommendation only becomes protection when Parliament passes it. It hasn't.
Active reform items
- Joint Committee on the Legalisation of Medicinal Cannabis — interim report (tabled 25 September 2024, 13 recommendations). Recommendation 1: Minister for Infrastructure and Transport to draft Road Traffic Act amendments so it is not an offence for a prescribed patient using THC medicine per prescription to drive with THC present (Tasmanian model), with community consultation on the draft. (Committee recommendation only — no government response or bill identified.)
Quick answers for South Australia
Can I drive with a medicinal cannabis prescription in South Australia?
SA's official driver guidance states police conduct random roadside saliva tests for THC, methylamphetamine, cocaine and MDMA, and — unlike drink driving's concentration thresholds — the presence of any amount of these drugs is an offence. Refusing or failing to comply with drug testing is itself an offence, can mean immediate loss of licence at the roadside, and carries disqualification of at least 12 months on conviction. A parliamentary committee has recommended amending the Road Traffic Act so unimpaired prescribed patients would not commit an offence, but this is a recommendation only — not passed law.
Is a valid prescription a defence to drug driving in South Australia?
No. In South Australia, driving with detectable THC is an offence regardless of a valid prescription. Driving while impaired is a separate, more serious offence everywhere in Australia.
What happens if I test positive at a roadside drug test in South Australia?
You will be unable to drive for a period while your sample goes to a laboratory, and charges typically follow laboratory confirmation. See our step-by-step guide, “Tested positive in South Australia: what happens next”, and get legal advice early.
Primary sources for this page
- https://www.mylicence.sa.gov.au/road-rules/the-drivers-handbook/drugs
- https://www.legislation.sa.gov.au (Road Traffic Act 1961)