AS 4308:2023 sets the collection, chain of custody, and screening cut-off requirements for urine-based workplace drug testing in Australia. AS 4760:2019 does the same for oral fluid (saliva) testing. Neither standard is universally mandated by statute — but deviating from them gives workers a well-worn path to challenge and overturn test results at the Fair Work Commission.
Why AS 4308 and AS 4760 exist — and who actually uses them
Before these standards existed, Australian workplace drug testing was a patchwork of inconsistent collection procedures, variable cut-off concentrations, and disputed chain of custody practices. The result was a body of industrial case law in which dismissed workers routinely succeeded on procedural grounds — not because they weren’t using drugs, but because the collection and analysis process was so poorly documented that the test result couldn’t be relied upon.
Standards Australia published AS 4308 (urine) in 1995, with subsequent revisions through to the current AS 4308:2023. AS 4760 (oral fluid) was first published in 2006 and revised to the current AS 4760:2019. Both are developed by technical committees that include NATA-accredited laboratories, occupational health professionals, employer groups, and unions.
Sectors where compliance is effectively mandatory through regulation include offshore oil and gas (NOPSEMA), rail (Rail Safety National Law), aviation (CASA), and mining in most jurisdictions. Outside those regulated sectors, compliance is best practice — and the standard every Fair Work commissioner will reference when a dismissed worker argues their test wasn’t valid.
What AS 4308:2023 requires for urine testing
AS 4308:2023 covers the entire process from the moment collection is triggered to the point where a confirmed result is produced. The six critical requirements that employers most commonly fail on are:
Collector competency
The person collecting the specimen must be trained and assessed as competent in AS 4308 collection procedures. This is not satisfied by watching a video or reading the instructions on a collection kit. Competency must be formally assessed and documented. A collection by an untrained supervisor is a procedural failure regardless of how it was otherwise conducted.
Specimen volume and temperature
A minimum of 30 mL of urine must be collected. Specimen temperature must be measured and recorded within 4 minutes of collection and fall between 32°C and 38°C. Temperature outside that range is grounds for treating the specimen as invalid or adulterated. This single check catches the most common attempt to substitute a clean specimen.
Chain of custody documentation
A chain of custody form (CCF) must accompany every specimen from collection to laboratory. Every transfer of the specimen must be documented — who handed it over, who received it, date, time, and condition. A break in chain of custody — even a minor undocumented transfer — is a standard basis for challenging a result.
Split sample availability
The donor must be offered the opportunity to have a split sample retained so they can request independent laboratory analysis if they dispute the result. Failure to offer a split sample, or failing to retain it correctly, removes the worker's right to challenge the analysis and will typically result in the result being set aside in any subsequent proceeding.
Screening cut-off concentrations
On-site screening devices must be validated against the AS 4308:2023 cut-off concentrations for each drug class. A screen-reactive result at the cut-off concentration is presumptive only — it must be confirmed by a NATA-accredited laboratory using GC-MS or LC-MS/MS before any disciplinary process begins.
Privacy and dignity
Collection must be conducted in a manner that protects the donor's privacy and dignity. Direct observation of urination is not permitted unless there is documented reason to suspect adulteration and a specific, documented decision to use observed collection. The collection area must not have access to a water source that would allow dilution.
AS 4760:2019 — oral fluid testing and why it is displacing urine in safety-critical industries
Oral fluid testing has grown significantly in Australian safety-critical industries over the past decade, and AS 4760:2019 is the reason it holds up in proceedings. The oral fluid matrix offers two practical advantages over urine that matter for safety management rather than punitive detection.
First, the detection window for cannabis in oral fluid is substantially shorter than in urine — approximately 6 to 24 hours compared to days or weeks. This means a reactive oral fluid screen for cannabis correlates more closely with recent use than a urine screen result, which can reflect cannabis use from weeks prior. For safety reasoning, “this worker is likely to have been under the influence during the shift” is a more defensible basis than “this worker used cannabis at some point in the last month.”
Second, oral fluid collection is direct and observed without the privacy complications of urine collection — adulteration is far more difficult.
| Factor | Urine (AS 4308) | Oral Fluid (AS 4760) |
|---|---|---|
| Cannabis detection window | 3–60 days depending on use pattern | 6–24 hours typical |
| Methamphetamine window | 3–5 days | 24–48 hours |
| Collection privacy | Private bathroom required | Direct observed — no privacy issue |
| Adulteration risk | Moderate — substitution, dilution | Very low |
| On-site screening device | Validated immunoassay strip | Validated oral fluid device (e.g. Securetec, DrugWipe) |
| Lab confirmation | GC-MS / LC-MS/MS — NATA-accredited lab | LC-MS/MS — NATA-accredited lab |
| Cut-off for THC screening | 50 ng/mL (THC-COOH) | 25 ng/mL (THC parent compound) |
The legislative framework that sits around these standards
No single piece of legislation mandates AS 4308 or AS 4760 compliance across all industries — but several statutes create the environment in which compliance is effectively required.
The Work Health and Safety Act 2011 (model WHS Act, adopted in all jurisdictions except Victoria and Western Australia which have their own equivalents) requires employers to eliminate or minimise risks to health and safety so far as is reasonably practicable. An employer who has reason to believe a worker is impaired by drugs or alcohol and who fails to act — including failing to test when their policy requires it — may be in breach of their primary duty of care. Having a testing program that is not procedurally valid does not fulfil this duty.
The Fair Work Act 2009 governs the threshold for valid reasons for dismissal at s.387. A confirmed drug test result from a properly conducted AS 4308 or AS 4760 collection is strong evidence of a valid reason. A screen-reactive result from a procedurally defective collection is frequently rejected as insufficient evidence — and commissioners are experienced enough to identify the common procedural failures.
The Privacy Act 1988 and the Australian Privacy Principles (APPs) govern how biological specimen data and test results are collected, stored, and disclosed. Drug test results are sensitive health information under APP 3 — employers must collect them only for a specified legitimate purpose (safety management), store them securely, and not disclose them beyond what is necessary for that purpose.
In regulated sectors — offshore petroleum under the Offshore Petroleum and Greenhouse Gas Storage Act 2006, rail under the Rail Safety National Law, aviation under Civil Aviation Safety Regulations — compliance with AS 4308 or AS 4760 (or their equivalent) is a specific regulatory requirement, not merely best practice.
The seven procedural errors that get test results thrown out
Fair Work Commission decisions consistently identify the same failure modes. If any of these appear in your process, a dismissed worker has a viable challenge path before you even get to whether they were actually impaired.
Acting on screen-reactive result before lab confirmation
Dismissal without valid reason — reinstatement likely
Collector not formally assessed as competent under the standard
Entire collection procedurally invalid
Chain of custody form incomplete or unsigned
Result inadmissible as evidence of impairment
Split sample not offered or not retained
Worker denied right to independent analysis — standard basis for reinstatement
Temperature not checked within 4 minutes
Specimen validity in question — adulteration or substitution cannot be excluded
Worker not given opportunity to explain before disciplinary decision
Procedural fairness failure under Fair Work Act s.387(b)
Policy says “urine testing” but oral fluid device used (or vice versa)
Policy non-compliance — disciplinary action may not be supported
Frequently asked questions
What is the difference between AS 4308 and AS 4760 for workplace drug testing?
AS 4308:2023 governs urine specimen collection and on-site screening for drugs of abuse — it covers how specimens are collected, handled, and screened in the workplace. AS 4760:2019 governs oral fluid (saliva) testing — the collection device, screening cut-offs, and chain of custody for saliva-based tests. Both standards are referenced in Australian court decisions and Fair Work Commission rulings as the benchmark for procedurally valid workplace drug testing. Which standard applies depends on which biological matrix your policy uses. Many employers specify both in a single Drug and Alcohol Policy that allows either collection method depending on role and situation.
Are Australian employers legally required to follow AS 4308 and AS 4760?
There is no federal statute that mandates AS 4308 or AS 4760 compliance for all employers. However, industry regulators (the National Offshore Petroleum Safety and Environmental Management Authority, Rail Safety National Law, and various state mining and transport regulators) do require compliance with these standards in their sectors. More broadly, any drug test result used as a basis for disciplinary action or dismissal is likely to face scrutiny in the Fair Work Commission or a state industrial tribunal — and deviations from AS 4308 or AS 4760 have repeatedly been used to successfully challenge test results and reinstate dismissed employees. Compliance is the practical standard for any test result you expect to hold up.
What drug classes does AS 4308:2023 require urine testing to cover?
AS 4308:2023 specifies screening cut-off concentrations for seven drug classes in urine: cannabis metabolites (THC-COOH), amphetamine-type stimulants (including methamphetamine), cocaine metabolites (benzoylecgonine), opioids (morphine, codeine, heroin metabolites), benzodiazepines, oxycodone, and phencyclidine. Workplace policies may add additional analytes — including designer drugs and synthetic cannabinoids — but these fall outside the AS 4308 cut-off framework and require NATA-accredited laboratory confirmation. Alcohol is not covered by AS 4308; it is tested separately under a different methodology.
Can a worker challenge a drug test result on procedural grounds in Australia?
Yes — and it happens regularly. Fair Work Commission decisions including Endeavour Energy v CEPU [2012] and multiple mining sector cases have turned on procedural failures: broken chain of custody, failure to offer a split sample, inadequate privacy for collection, a collector who was not trained and assessed as competent under the standard, or a screen-reactive result acted upon before laboratory confirmation. Any deviation from AS 4308 or AS 4760 procedure is a potential basis for challenge. This is why procedural compliance is not a paperwork exercise — it is the evidentiary foundation of every test result you act on.
Does a positive drug test allow an employer to immediately stand down or dismiss a worker?
A screen-reactive (presumptive positive) result on an on-site device is not a confirmed positive and cannot by itself support dismissal or disciplinary action. The AS 4308 and AS 4760 process requires laboratory confirmation of all screen-reactive results before any disciplinary outcome is pursued. A confirmed positive result is then a piece of evidence — not an automatic outcome. The employer must consider: whether the worker was on duty at the time, whether the confirmed level is above the policy impairment threshold, whether there is a legitimate medical explanation (prescription medication), and whether dismissal is proportionate given the worker's length of service, role criticality, and disciplinary history. Workers must also be given the opportunity to explain before a decision is made, under the Fair Work Act 2009 s.387 criteria for unfair dismissal.
How long does THC stay detectable in urine testing under AS 4308?
The AS 4308:2023 screening cut-off for THC-COOH (the primary cannabis metabolite in urine) is 50 ng/mL. At this cut-off, detection windows vary substantially by use pattern: occasional users typically test negative within 3–7 days of last use; regular users within 10–21 days; and heavy daily users can return reactive results for 30–60 days after cessation. This creates a significant policy challenge — urine cannabis detection measures historical exposure, not current impairment. Many employers in safety-critical industries are moving to oral fluid testing under AS 4760 for cannabis, where the detection window for oral fluid is shorter (approximately 6–24 hours) and more closely correlates with recent use.
Drug & Alcohol Testing — Service Pillar
OccuSpan’s AS 4308 and AS 4760 compliant testing programme for Australian employers.
Fitness for Work Assessment
When a fitness for work assessment is triggered — including post-incident drug testing.
Pre-Employment Screening Guide
Drug and alcohol testing in the pre-employment context and IROJ-calibrated screening.
Occupational Health Assessment Guide
The broader occupational health assessment framework that drug testing sits within.
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