Drug Driving Lawyer Cairns — Charges, Penalties and Sentencing

Drug Driving in Queensland — The Zero-Tolerance Framework

Queensland operates a zero-tolerance framework for drug driving. Under section 79(2AA) of the Transport Operations (Road Use Management) Act 1995 (Qld), it is an offence to drive or be in charge of a vehicle while a "relevant drug" is present in your saliva or blood. There is no threshold — any detectable amount of a relevant drug triggers the offence.

This is fundamentally different from drink driving, where the offence depends on the BAC exceeding a specific limit. For drug driving, the question is binary: was a relevant drug present, or was it not? The amount does not matter. The level of impairment does not matter. The presence of the drug alone is sufficient for the offence.

The relevant drugs tested for in Queensland roadside drug testing are:

• THC (delta-9-tetrahydrocannabinol) — the active component of cannabis
• Methylamphetamine (methamphetamine / ice)
• MDMA (ecstasy)

These are the only three drugs detected by the roadside saliva test. Other drugs — prescription medications, cocaine, heroin, GHB — are not detected by the roadside test but can be detected through blood analysis if the driver is taken to a hospital for a blood test (which typically occurs after an accident or where the officer suspects impairment from a drug not covered by the saliva test).

The Roadside Drug Testing Process

Queensland Police conduct Random Drug Testing (RDT) operations alongside Random Breath Testing. The RDT process involves a two-stage saliva test:

Stage 1: Preliminary Saliva Test

The driver is asked to place a testing device in their mouth for a short period (typically 3–5 minutes). The device collects a saliva sample and provides a preliminary indication of whether a relevant drug is present. This test is conducted at the roadside.

If the preliminary test is negative, the driver is released.

If the preliminary test is positive or inconclusive, the driver proceeds to Stage 2.

Stage 2: Confirmatory Saliva Test

The driver is taken to a police station or mobile testing unit for a second saliva test. This test uses a more precise device and produces a more reliable result. The second sample is divided — one portion is tested immediately, and the other is sent to a laboratory for confirmatory analysis.

The laboratory analysis is the definitive result. If the laboratory confirms the presence of a relevant drug, the charge proceeds. If the laboratory does not confirm, the charge may be withdrawn.

Licence Suspension

Under section 79B, the driver's licence is immediately suspended for 24 hours following a positive preliminary test. If the confirmatory test is also positive, the suspension continues until the court date. The immediate suspension operates independently of the disqualification period imposed at sentencing.

What Your Lawyer Reviews

For the majority of drug driving charges where the laboratory confirms a positive result, a guilty plea is the appropriate course and the focus is on sentencing preparation. However, a lawyer will always review the prosecution brief before advising on plea — because the prosecution must still prove every element of the charge, including that the testing procedure was followed correctly.

The review includes checking the saliva testing procedure, the laboratory analysis, the chain of custody for the sample, and the operator's compliance with the approved testing protocol. If there is a genuine issue with the evidence, your lawyer will advise you on the options. In practice, the prosecution brief is usually in order, and the advice will be to plead guilty and focus on achieving the best possible sentencing outcome.

The Prescribed Medication Defence

There is a statutory defence for drivers who test positive to a relevant drug but were taking it as a prescribed medication in accordance with a valid prescription. This defence applies specifically to medications containing methylamphetamine (such as dexamphetamine, prescribed for ADHD) and, in limited circumstances, other scheduled substances.

To rely on this defence, the defendant must demonstrate:

• They had a valid prescription for the medication from a registered medical practitioner
• They were taking the medication in accordance with the prescriber's directions (correct dosage, correct timing)
• The drug detected in the saliva test was the prescribed medication, not a recreational substance

This defence does not apply to cannabis (THC). There is no prescribed medication defence for cannabis — even if the driver has a valid prescription for medicinal cannabis, a positive THC result is an offence. As of 2026, the law in Queensland is clear: medicinal cannabis is not a defence to drug driving.

Detection Windows and Sentencing

THC can remain detectable in saliva for 12–72 hours after consumption. Methylamphetamine can remain detectable for 24–48 hours. The offence is based on the presence of the drug, not on impairment — so a person who consumed a drug days before driving may still test positive even though the impairing effects have worn off.

While the delay between consumption and driving is not a defence, it is relevant to sentencing. A magistrate is likely to view a person who used cannabis the previous evening and drove the following day differently from a person who used immediately before driving. Your lawyer will present this context as part of the sentencing submissions.

Sentencing for Drug Driving

The sentencing framework for drug driving mirrors the drink driving framework in structure, but the specific penalties differ:

First Offence

• Disqualification — minimum 1 month, maximum 9 months
• Fine — up to 14 penalty units (first offence)
• Conviction — a criminal conviction is recorded unless the magistrate exercises the discretion not to record one

Second or Subsequent Offence (within 5 years)

• Disqualification — minimum 3 months, maximum 18 months
• Fine — up to 28 penalty units (repeat offence)
• Imprisonment — up to 6 months for second offences; up to 12 months for third or subsequent

Drug Driving vs Driving Under the Influence (DUI)

A drug driving charge under section 79(2AA) is a presence-based offence — it requires detection of a relevant drug in saliva or blood. A separate, more serious offence exists under section 79(1): Driving Under the Influence (DUI), which is an impairment-based offence. DUI does not require a positive drug test — it requires evidence that the driver was impaired by a drug to the extent that they could not properly control the vehicle.

DUI charges are more serious, carry higher penalties (including imprisonment for a first offence), and involve different evidence — typically the observations of the arresting officer about the driver's behaviour, coordination, speech, and driving patterns. A driver can be charged with both drug driving (presence) and DUI (impairment) arising from the same incident.

Work Licences and Drug Driving

Whether a work licence is available for a drug driving charge depends on the offence provision and the licence type — not a blanket rule.

When a Work Licence IS Available

An open or provisional licence holder charged under section 79(2AA) (driving with a relevant drug present in saliva or blood) can apply for a work licence under section 87. Section 79(2AA) is not listed in the section 87(5)(da) bar. The general eligibility requirements still apply — no prior disqualification or conviction within five years, the offence was not committed during work, and the applicant must demonstrate extreme hardship.

When a Work Licence is NOT Available

Learner, provisional (P1/P2), heavy vehicle, taxi or rideshare, restricted licence, section 79E, or interlock drivers charged under section 79(2AA) cannot apply. They are barred by section 87(5)(dc).

A person charged with Driving Under the Influence (DUI) of a drug under section 79(1) — the impairment-based offence — cannot apply for a work licence regardless of licence type. Section 79(1) is listed in the section 87(5)(da) bar.

This distinction is critical: "drug driving" covers both the presence-based offence (section 79(2AA)) and DUI-by-drug (section 79(1)). The work licence answer is opposite depending on which charge applies.