Glossary: Every Term in Australian Drug-Driving Law, Explained
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The jargon, decoded
Legal pages, police paperwork and news reports use these terms as if everyone knows them. Here's what each actually means. Cross-references point to the guide that covers the topic properly.
Presence offence. The offence of driving with a detectable drug in your system — no impairment required. The core of the whole problem for prescribed patients: chemistry, not conduct. Compare "driving under the influence."
Driving under the influence (DUI) / impaired driving. The separate, more serious offence of driving while actually affected by a drug. Applies everywhere, to everyone, prescription or not — and no reform proposal anywhere touches it.
MDT (Mobile Drug Testing) / RDT (Roadside Drug Testing). Police programs that stop drivers for saliva testing, at fixed sites or roving patrols. See: how roadside drug testing works.
Oral fluid test. The saliva swab used at the roadside. Screens for THC, methylamphetamine and MDMA — plus cocaine in some states. It detects presence, not impairment or dose.
THC (tetrahydrocannabinol). The psychoactive cannabinoid in cannabis, and the only cannabis compound roadside tests target. Present in most medicinal cannabis products, including many labelled as "balanced" or "CBD-dominant."
CBD (cannabidiol). A non-intoxicating cannabinoid. Not targeted by roadside tests — but CBD products can contain residual THC. See: CBD and driving.
Detection window. How long after a dose a drug remains detectable. For THC in oral fluid it varies dramatically with dose, frequency and biology — there is no safe universal number. See: how long does THC stay detectable?
Confirmatory / evidentiary test. The laboratory analysis of your sample. The roadside result is only a screen; the lab result is what supports a charge.
24-hour ban (or roadside suspension). The immediate no-driving period imposed after a positive roadside result, before any charge. Duration and mechanics vary by state.
Court Attendance Notice (CAN) / summons / notice to appear. The paperwork requiring you to attend court on a charge. Different names per state, same effect: a date you cannot miss.
Infringement / expiation / penalty notice. An on-the-spot fine route offered in some states for a first presence offence, instead of court. Paying usually closes the matter — and your options — which is why it deserves legal advice first. See: penalties by state.
Court election. Choosing to have an infringement dealt with by a court instead of paying it. Risk in both directions: courts can do more, and courts can do less (including non-conviction outcomes).
Non-conviction order (e.g. "section 10" in NSW). A finding of guilt without recording a conviction, sometimes available at court. State names and rules differ; whether one is realistic in your matter is a question for a lawyer.
Licence disqualification vs suspension. Suspension pauses your licence for a period; disqualification cancels it and typically requires you to reapply. The difference matters for insurance questions and job applications for years afterwards.
Work licence / restricted licence / hardship order. Court-granted permission to drive for limited purposes (usually work) during a disqualification. Availability for drug-driving varies sharply by state, and application timing rules are strict. See: losing your licence.
Prescription defence. A statutory defence for lawful, unimpaired prescribed use — currently Tasmania's model, and what most reform campaigns seek. See: the comparison table.
Licence discretion (Victoria). Victoria's s50(1F) model: the offence and fine stand, but the magistrate may decline to cancel a prescribed, unimpaired patient's licence.
Registration scheme (NSW, proposed). The 2026 Bill's model: registered patients receive warning letters for a first and second detection rather than penalties. Not yet law. See: the NSW scheme explained.
Penalty unit. How fines are written in legislation — a dollar multiplier that each state updates periodically. "25 penalty units" means 25 × that state's current unit value.
TGA / SAS / Authorised Prescriber. The Commonwealth pathways under which medicinal cannabis is lawfully prescribed. Relevant to driving law only as proof your use is lawful — the roadside doesn't care which pathway your script came through.