When it comes to drug and alcohol testing at work in Queensland, there are two prevailing myths. The first is that employers have the right to test you whenever they like, and the second, and more damaging, is that a failed test after a workplace injury automatically ends any compensation claim.
Both are incorrect, however, and the second is incorrect in a way that can end up costing an injured worker thousands of dollars they were actually entitled to.
Let’s take a closer look at the reality of the situation.
The everyday myth: "My boss can test me whenever they want"
This might seem like it would be true, especially in industries with a heavy focus on safety like mining and construction, where testing is routine. In reality, there are several clear boundaries.
There is no single Queensland law that says employers can or cannot drug test. Testing protocol is governed by employment contracts or enterprise agreements, workplace drug and alcohol policies, the Fair Work Act 2009 (Cth) and work health and safety duties.
The common thread is that all tests have to be lawful and reasonable.
Testing is allowed because of safety, not surveillance. Under the Work Health and Safety Act 2011 (Qld), employers must ensure the health and safety of all workers so far as is reasonably practicable.
In turn, workers must take reasonable care that they don’t put others at risk. Testing that genuinely serves this purpose is defensible, but testing used to police what someone does in their personal life is on far shakier ground.
In the case of Briggs v AWH Pty Ltd, the Fair Work Commission accepted that random testing can be lawful in safety-critical workplaces, while stressing that the point is to manage risk and not private conduct.
The refusal myth: "I can just say no"
It’s often assumed that refusing a test comes with no real consequences, but this isn’t true.
If an employer has a lawful and reasonable testing policy, refusing a test can be treated as a failure to follow a reasonable direction, and in certain cases as serious misconduct. In fact, dismissals have been upheld on that basis.
On the other hand, if an employer never properly introduced or communicated their testing policy, or applies it inconsistently, ordering a test may not be reasonable in the first place.
The lesson here is not to refuse a test blindly. Instead, raise your concerns through the policy or HR instead of simply walking away from the test.
The dismissal myth: "A positive test means I'm gone"
A positive result is certainly a serious thing, but it isn’t necessarily an automatic sacking.
Whether or not a dismissal is upheld depends on the policy, how safety-sensitive the role in question is and whether the worker received procedural fairness.
The Commission has found dismissals unfair even where there was a valid reason in cases where the worker wasn’t given the policy or written allegations, and where factors like long service and an otherwise clean record weren’t taken into account.
The expensive myth: "Drugs or alcohol were involved, so my claim is dead"
This is a common misunderstanding that causes real financial damage, which is why it’s so important for Queensland workers to get right.
There is no clause in Queensland's workers' compensation law that says intoxication automatically cancels a claim. Under the Workers' Compensation and Rehabilitation Act 2003 (Qld), being under the influence of drugs or alcohol when injured does not, by itself, preclude you from pursuing an entitlement.
As the Queensland Law Handbook puts it, simply being intoxicated during a work-related injury does not automatically prevent the injured person from claiming compensation.
A claim can still be reduced or refused if intoxication is involved, but only through narrower paths that are harder to fulfill than people assume.
Compensation won’t be paid for injuries that are intentionally self-inflicted. That is about intent to cause injury, a high bar which ordinary intoxication does not meet.
If an injury is caused by a worker's serious and wilful misconduct, compensation is generally not payable, although there is one important exception. Entitlements are still available where the injury results in death or a degree of permanent impairment of 50 per cent or more.
The rules are tighter when it comes to injuries suffered on a work journey. An injury that happens while driving to or from work can fall outside cover if the worker was driving under the influence because it’s in breach of the Transport Operations (Road Use Management) Act 1995, but only where the breach in question was the "major significant factor" that caused the event.
That phrase is key here. Intoxication generally has to be the cause of what happened, drugs or alcohol being present in the worker's system at the time isn’t enough.
A positive test triggers scrutiny and possibly a dispute, it doesn’t automatically end the claim.
That’s why the difference between tests matters more than most workers realise.
Why the tests themselves change the picture
Not all tests measure the same thing, and the gap between them is where a lot of unfairness comes up.
Urine testing, conducted to the Australian Standard AS/NZS 4308, can detect drug use from days earlier. These tests can flag someone who used drugs or alcohol in their own time and was working completely unimpaired. Oral fluid or saliva testing, conducted to AS/NZS 4760, is used to detect recent use and is closer to a measure of current impairment.
The Fair Work Commission has made their feelings on the distinction clear. In the well-known Endeavour Energy case, mandating urine testing was found to be unreasonable where saliva testing was available, precisely because a urine test flags past use instead of impairment at work.
For an injured worker, that is a decisive distinction. A positive urine result after an injury occurs does not establish that drugs were the cause of the incident, and causation is what the workers' compensation exclusions actually hinge on.
Your test results are private health information
It’s important to remember that the results of a drug or alcohol test are sensitive personal data which the Office of the Australian Information Commissioner treats as "sensitive information." This means they carry a higher level of protection than ordinary personal details.
How that information is collected, stored and shared is strictly governed.
What this actually means for you
Workplace injuries in Queensland are serious and, sadly, all too common.
Safe Work Australia recorded 188 worker deaths from traumatic injuries across the country in 2024, with vehicle incidents the single largest category at 42 per cent. The stakes around a workplace injury claim are severe and very real.
There are several practical points that follow from the law as it stands:
Know your workplace policy well because that document, alongside the Fair Work Act and your safety duties, sets what testing is actually allowed.
Understand the difference between impairment and past use, as a positive result is not the same as proof you were under the influence when you were hurt.
If you are injured at work, report it, get medical treatment and lodge a claim with WorkCover Queensland as soon as possible. The fact that drugs or alcohol were in the picture does not, on its own, end your claim.
And if a claim is rejected on intoxication grounds, don’t treat it as a verdict you must accept. Whether the exclusion truly applies comes down to causation, and causation is rarely as simple as test results.
