Drug Driving Cairns — Penalties, Medicinal Cannabis and Queensland Law

The Queensland Drug Driving Framework

Queensland's drug driving laws are governed by the Transport Operations (Road Use Management) Act 1995 (Qld). The framework is based on presence, not impairment. Under section 79(2AA), it is an offence to drive or be in charge of a vehicle while a "relevant drug" is present in your saliva or blood. The amount does not matter. The level of impairment does not matter. If a relevant drug is detectable, you have committed an offence.

The three relevant drugs detected by roadside saliva testing in Queensland are:

• THC (delta-9-tetrahydrocannabinol) — the active psychoactive component of cannabis
• Methylamphetamine — methamphetamine, commonly known as "ice" or "speed"
• MDMA — 3,4-methylenedioxymethamphetamine, commonly known as "ecstasy"

Other controlled substances — cocaine, heroin, prescription opioids, benzodiazepines, ketamine — are not detected by the roadside saliva test but can be identified through blood analysis, which is typically ordered after traffic accidents or where the officer suspects impairment from a substance not covered by saliva testing.

Penalties for Drug Driving in Queensland

The penalties for drug driving are set out in section 79 of the TORUM Act and follow a tiered structure based on prior offending history:

First Offence

• Maximum fine: 14 penalty units
• Disqualification: minimum 1 month, maximum 9 months
• Imprisonment: not applicable for first offence
• Work licence: available for open and provisional licence holders charged with the standard drug driving offence. Not available for learner/P-plate/heavy vehicle/restricted/interlock drivers, or for the more serious DUI-by-drug charge

Second Offence (within 5 years)

• Maximum fine: 28 penalty units
• Disqualification: minimum 3 months, maximum 18 months
• Imprisonment: up to 6 months

Third or Subsequent Offence (within 5 years)

• Maximum fine: 40 penalty units
• Disqualification: minimum 6 months, maximum 2 years
• Imprisonment: up to 12 months

The "within 5 years" calculation is important. Queensland counts prior drug driving offences within the last five years when determining the penalty tier. An offence older than five years does not count — a person with a 2019 drug driving conviction is treated as a first offender in 2026.

Important: drug driving and drink driving offences are counted separately. A prior drink driving conviction does not make a drug driving charge a "second offence," and vice versa. They are different offences under different subsections of section 79.

Medicinal Cannabis and Drug Driving — The 2026 Legal Position

This is the most significant practical issue in Queensland drug driving law. As of 2026, approximately 900,000 Australians have been prescribed medicinal cannabis through the Therapeutic Goods Administration's Special Access Scheme or Authorised Prescriber pathway. In Far North Queensland, the number of medicinal cannabis patients is growing rapidly — particularly for chronic pain, PTSD, anxiety, and insomnia.

The legal position is clear and, for many patients, deeply frustrating:

Why the Law Has Not Changed

The argument for excluding medicinal cannabis from the prescribed medication defence rests on the difficulty of establishing an impairment threshold for THC. Unlike alcohol — where the relationship between BAC and impairment is well-established — the relationship between THC levels in saliva and driving impairment is less clear. THC is detectable in saliva long after the impairing effects have worn off, and the level of impairment varies significantly between individuals, depending on tolerance, frequency of use, and metabolism.

The Queensland Government's position, as of 2026, is that the zero-tolerance approach is the most practical way to manage drug driving risk, even if it captures people who are prescribed cannabis and are not impaired. This position is contested by patient advocacy groups, the medical profession, and a growing number of legal practitioners.

What Medicinal Cannabis Patients Need to Know

• THC detection windows — THC can remain detectable in saliva for 12 to 72 hours after use, depending on the product, the dose, the frequency of use, and individual metabolism. For regular users (daily medicinal use), THC may be detectable at virtually all times.
• No safe waiting period — unlike alcohol, where a person can estimate the time needed for their BAC to return to zero, there is no reliable way to predict when THC will no longer be detectable in saliva. This means there is no guaranteed "safe" window for driving after using medicinal cannabis.
• The choice — under the current law, patients prescribed THC-containing medicinal cannabis face a binary choice: use the medication as prescribed and accept the risk of a drug driving charge, or refrain from driving. For patients in regional areas like Cairns and Far North Queensland, where public transport is limited and driving is essential, this is a genuine hardship.
• Other states — Tasmania and the ACT have enacted medicinal cannabis driving defences. Victoria and New South Wales have conducted or are conducting trials. Queensland has not enacted a defence and has not announced plans to do so.

Sentencing Factors Specific to Drug Driving

The sentencing outcome for a drug driving charge depends on several factors that the magistrate weighs when determining the disqualification period and fine within the statutory range:

Type of Drug

In practice, the type of drug detected influences sentencing. A THC-only result (cannabis) is generally viewed less seriously than a methylamphetamine result (ice). This is not reflected in the legislation — the penalties are the same regardless of which relevant drug is detected — but it is reflected in sentencing practice in the Cairns Magistrates Court.

Context of Use

The circumstances of the drug use are relevant. A person who used cannabis at home the previous evening and drove the following day presents a different sentencing picture from a person who used methylamphetamine an hour before driving. The delay between use and driving, while not a legal defence, is a relevant sentencing factor.

Medicinal Use

While medicinal cannabis is not a legal defence to the charge, it is a relevant sentencing factor. A person who tests positive to THC because they are using a prescribed medication for a genuine medical condition will generally receive a more lenient sentence than a person using cannabis recreationally. The prescription, the treating doctor's letter, and the medical records should be presented to the magistrate at sentencing.

Traffic and Criminal History

A clean traffic history and no prior criminal record are the strongest mitigating factors. Prior drug driving offences within five years elevate the penalty tier. Prior drink driving offences, while not counted as "prior drug driving," are relevant to the magistrate's assessment of the defendant's overall pattern of behaviour on the road.

Drug Driving and Employment

A drug driving disqualification has a disproportionate impact on employment in Far North Queensland. In Cairns and the surrounding region, public transport options are limited, distances are significant, and many jobs — trades, construction, agriculture, tourism, transport — require driving. Whether a work licence is available depends on the type of charge and the driver's licence category.

Open and provisional licence holders charged with the standard drug driving offence (drug present in your system) can apply for a work licence, subject to the usual requirements — no prior conviction or disqualification within five years, you were not driving for work at the time, and you must demonstrate extreme hardship. Learner, P-plate, heavy vehicle, taxi, rideshare, restricted, and interlock drivers cannot apply, even for the standard charge. And anyone charged with the more serious offence of Driving Under the Influence (DUI) of a drug cannot apply regardless of licence type.

For employees whose job requires driving, a drug driving conviction may result in:

• Termination — if the employment contract specifies driving as an essential requirement and the employee cannot perform the role without a licence
• Demotion or reassignment — to a role that does not require driving, if one is available
• Loss of income — reduced hours or reduced pay during the disqualification period

This employment impact is relevant to sentencing — a shorter disqualification within the available range may be appropriate where the consequence of a longer disqualification is loss of employment. The employer's letter confirming the impact is critical evidence.

Comparing Drink Driving and Drug Driving Penalties

The penalty structures are similar but the practical consequences differ in important ways:

• Work licence — available for all eligible drink driving charges. For drug driving, available only to open and provisional licence holders charged with the standard offence. Learner, P-plate, heavy vehicle, restricted, and interlock drivers cannot apply. DUI-by-drug is always barred.
• Interlock device — required for mid-range and high-range drink driving. Not applicable to drug driving.
• Legal limit — drink driving has a tiered system based on BAC (0.050, 0.100, 0.150). Drug driving is zero-tolerance — any detectable amount.
• Detection window — alcohol clears the system within hours. THC can be detected for days. This means the risk period for drug driving extends far beyond the period of impairment.

Law Reform Advocacy

The interaction between medicinal cannabis prescriptions and zero-tolerance drug driving laws is the subject of active advocacy across Australia. The key arguments for reform include:

• Patients are being criminalised for using legally prescribed medication
• The zero-tolerance approach does not correlate with impairment — a patient who used medicinal cannabis 24 hours before driving may test positive but is not impaired
• Regional patients are disproportionately affected because they have no alternative to driving
• Tasmania and the ACT have enacted defences without measurable increases in drug-impaired driving

Until Queensland law changes, however, the position remains: a positive THC result is a criminal offence, regardless of the reason for the THC being present. Patients who use THC-containing medicinal cannabis and drive accept this legal risk.