Pulled Over for a Random Breath Test in NSW? Know Your Rights

Random breath testing (‘RBT’) is a routine part of road policing in NSW. If you are stopped by police, it is important to understand when police can require a breath test, what happens if the result is positive, and what your options are if you are charged with a drink-driving offence.

What Happens During a Random Breath Test

In NSW, police can stop you at any time to conduct a RBT, and you are required by law to provide a breath sample, even if police have no particular suspicion that you have consumed alcohol.

RBT has been part of NSW road policing since 1982. The power comes from Schedule 3 of the Road Transport Act 2013 (NSW), which allows police to require a driver to submit to a preliminary breath test in a range of circumstances, including:

• When you are driving, or occupying the driver’s seat and attempting to start the vehicle;
• After a motor vehicle crash; and
• When police reasonably believe you were driving in the previous two hours.

You do not have a right to refuse the initial roadside test. Refusing or failing to provide a sample without a reasonable excuse can itself constitute an offence.

At the roadside, the officer will ask you to blow into a small handheld device. This is the preliminary test. It gives an immediate indication only, it is not the reading used to charge you.

If the preliminary test is positive, or if you refuse it, police can arrest you and take you to a police station or a nearby breath analysis vehicle (a ‘booze bus’) for a second, more accurate test on an approved breath analysis instrument. That second reading is the one that matters in court.

What Police Can Do

During an RBT stop, police generally can:

• Direct you to pull over and stop your vehicle
• Require you to provide a preliminary breath sample
• Arrest you if you return a positive reading or refuse the test
• Take you to a station or booze bus for breath analysis
• Ask for your licence and basic identifying details

What Police Cannot Do

There are limits on RBT powers. For example, police generally cannot:

• Require a breath test more than two hours after you last drove
• Conduct a breath test at your home
• Force you to answer questions about how much you have had to drink, although refusing the test itself is a separate offence

These boundaries exist for a reason, and if police step outside them, the evidence gathered may be challenged.

What the Alcohol Limits are in NSW

One of the most common misunderstandings is what ‘intoxicated’ actually means under NSW road transport law. In plain English, it is not about whether you feel drunk, slur your words, or think you are fine to drive. The law works on measurable blood or breath alcohol concentration (‘BAC’).

The applicable alcohol limit depends on the type of licence you hold and the vehicle you are driving. Under the Road Transport Act 2013 (NSW), the principal prescribed concentration of alcohol (‘PCA’) ranges are:

• Novice range: above zero and below 0.02, applies to learner and provisional licence holders
• Special range: 0.02 to below 0.05, applies to certain licence classes, including public passenger and heavy vehicle drivers
• Low range: 0.05 to below 0.08
• Mid range: 0.08 to below 0.15
• High range: 0.15 and above

The penalties for a PCA offence depend on the alcohol range, whether the matter is dealt with as a first or subsequent offence, and the circumstances of the case. Consequences may include a fine, licence disqualification and, in some cases, imprisonment. Immediate licence suspension will also apply in most cases where you are charged with a PCA offence.

Separate from PCA, there is also the offence of driving under the influence (‘DUI’), which does not require a specific reading. For DUI, the prosecution must prove your ability to drive was actually affected by alcohol or another drug. Evidence might include your driving pattern, appearance, speech, or coordination.

Why the Definition Matters

Because the definition of intoxication under the law is a measurable number, not a feeling, drivers are often caught out. Factors that affect your reading include:

• How much you drank and over what period
• Your body weight and gender
• Whether you have eaten
• The strength of the drinks (many restaurant pours are larger than a standard drink)
• How much time has passed since your last drink

A driver who genuinely believed they were under the limit will still be charged if the breath analysis reading says otherwise. Honest belief that you were under the limit is not a defence to a PCA charge.

What to Do if You’re Stopped

A roadside stop is not the moment to argue the law. What you do in the next few minutes can affect what happens later.

• Pull over safely and stay calm. Keep your hands visible and follow the officer’s directions.
• Do not refuse a required test without first understanding the consequences. Refusing or failing to comply can result in a separate and serious charge. Be polite, but be careful what you volunteer. You must give your name, address and licence, but you are not required to answer detailed questions about what or when you drank. In some cases, casual answers become evidence.
• Make a note of relevant details when you can. The time of the stop, the testing procedure and any relevant conversations may be important if you later receive legal advice.
• Seek legal advice after your release. If you have been arrested, charged and released, contact a lawyer as soon as practicable. A lawyer can review the charge and available evidence, explain the potential consequences and advise you on your options before your first court date.

What Happens Next if You’re Charged

If the breath analysis returns a reading at or above the relevant threshold, you will usually be issued with a Court Attendance Notice that tells you when you need to attend Court, and in most circumstances, an immediate licence suspension. It is important you keep all paperwork that police give you so that you can provide it to a lawyer.

Your options from that point depend on your circumstances, including your driving record, the reading, whether there were any aggravating features present in the offending and the range of PCA charged.

A lawyer can give you advice as to whether you should consider pleading not guilty and challenging the charge, for example, on procedural grounds, the reliability of the reading, or the two-hour rule.

If you enter a plea of guilty, depending on the offence, the consequences may include a fine, a period of licence disqualification, an interlock order and, in more serious cases, imprisonment.

It is important to have realistic expectations about sentence outcomes. A dismissal without conviction under section 10(1)(b) of the Crimes (Sentencing Procedure) Act 1999 (NSW) is rare in drink-driving matters. A conditional release order (‘CRO’) without conviction is also an uncommon outcome. However, a good lawyer will assess your individual circumstances and tell you honestly if a non-conviction outcome is a possible outcome.

In most cases, the focus will be on achieving the best available outcome within the applicable sentencing framework. This may involve making submissions to:

• Reduce your licence disqualification period to the lowest period the Court can impose under the applicable legislation. The statutory minimum period of disqualification depends on the particular offence and whether you have relevant previous offences.
• Reduce your fine by presenting relevant information about your financial circumstances, personal circumstances and the offending.
• Avoid a sentence of imprisonment in more serious cases, where custody is a realistic possibility.

Each of those pathways has different consequences for your licence, your record and any interlock order. This is where clear advice about your situation makes a real difference.

Mandatory Interlock Order

If you are convicted of certain drink-driving offences in NSW, the Court is required to make an alcohol interlock order unless it grants an interlock exemption. This applies to a range of offences, including mid-range and high-range PCA offences and certain repeat drink-driving offences.

An alcohol interlock is a device fitted to a vehicle that requires the driver to provide a breath sample before the vehicle will start. If alcohol is detected, the vehicle will not start. The device also records information about its use.

Under an interlock order, you must first serve the applicable period of licence disqualification. You can then apply for an interlock licence and drive only a vehicle fitted with an approved interlock device for the required period. The length of the disqualification and interlock periods depends on the offence and whether it is a first or subsequent offence.

Getting Advice Early Makes a Difference

Most people in this position have never been in trouble with the law before, and the paperwork alone can be overwhelming. A short conversation with a lawyer early on, before your first court date, helps you understand the charge, the likely range of outcomes, and whether there are grounds to challenge the evidence.

If you have been stopped for a random breath test and charged with a drink driving offence, our traffic law team can walk you through your options step by step. If the matter also involves an allegation of dangerous or negligent driving that causes injury, our criminal law lawyers can advise on how those charges interact. Contact us for a confidential discussion about your circumstances.