DUI Stop & Breath Test Rights in Australia

No. Refusing a random breath test or a directed breath analysis is a criminal offence in every Australian state and territory. Police do not need reasonable suspicion — they can require any driver to submit to a test at any time. Penalties for refusal are equivalent to or greater than a high-range drink driving conviction, including automatic licence disqualification and potential imprisonment for repeat offenders.

The general limit for fully licensed drivers is 0.05 BAC in all states. Learner and provisional/probationary drivers must have a BAC of 0.00. Drivers of heavy vehicles, buses, and taxis/ride-share vehicles are also subject to a 0.00 limit in most jurisdictions. Readings between 0.05 and 0.149 trigger mid-range offences. Readings of 0.15 or above are classified as high-range, carrying the most serious penalties.

Yes. In NSW, VIC, QLD, WA, SA, NT, and the ACT, police can require both a breath test and an oral fluid drug test at the same roadside stop. They are separate legal requirements — passing a breath test does not mean you can refuse the drug test, and vice versa. Both are compulsory once directed.

In all states operating mobile drug testing programs, the offence is presence-based — meaning the offence is driving with a detectable drug concentration, regardless of impairment. If laboratory testing confirms THC, methamphetamine, MDMA, or cocaine in your oral fluid sample, you will be charged. The fact that you felt unaffected, or that days had passed since use, is not a defence under the legislation. A separate "impaired driving" offence also exists alongside the presence-based offence.

No. Breath test powers apply to the driver of a vehicle, not passengers. If you are a passenger and not driving, you cannot lawfully be required to submit to a breath test. However, if police have reasonable grounds to believe you are about to drive — for example, if you are found in the driver's seat with the engine running — they may require a test. Drug dog searches, if deployed, may affect all occupants of a vehicle depending on the applicable laws.

Not necessarily. The roadside screening device indicates a positive result but is not the evidentiary standard. If you return a positive result on the screening device, you will be required to take a more accurate evidentiary breath analysis test — usually at a police station using a type-approved breathalyser, or in some states via a mobile testing vehicle. The evidentiary test result is what forms the basis of any charge. You should request a copy of the evidentiary test certificate. In some states you can also request a blood test as an alternative to confirm or challenge the breath analysis result.

Yes, in most Australian states. An immediate licence suspension (ILS) can be imposed at the roadside — without a court hearing — if you return a positive breath or drug test above the relevant threshold. In NSW, VIC, QLD, WA, SA, and the ACT, police can issue a suspension notice on the spot. The suspension takes immediate effect. You will typically be told you cannot drive away and must arrange alternative transport. You may be able to appeal the suspension, but this must be done promptly — usually within a short window (e.g., 28 days in NSW). Contact a traffic lawyer immediately if this happens.

No. Being stopped for a random breath test does not automatically authorise a vehicle search. Police need additional grounds — reasonable suspicion that the vehicle contains drugs, weapons, or other contraband — to conduct a search. If police observe something during the stop (the smell of cannabis, visible drug equipment, your behaviour) they may form reasonable grounds. You can state "I do not consent to a search" — your refusal alone cannot be used as grounds. If a search occurs without lawful authority, evidence found may be challengeable in court. Never physically resist; comply and challenge it legally afterwards.

Blood tests are typically required in specific circumstances: where you are hospitalised after an accident and cannot complete a breath test, or where you have a medical reason preventing breath analysis. In most states you can also request a blood test as an alternative to confirm or challenge a breath analysis result. Blood samples must be taken by an authorised person (usually a nurse or doctor), following proper procedures. You are entitled to a portion of your blood sample for independent testing in most jurisdictions. Refusing a lawfully directed blood test is also an offence, with similar consequences to refusing a breath test.