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CBD at work: your rights and your employer's

Workplace drug tests look for THC, not CBD, but a prescription does not automatically protect you. What the standards, regulators and tribunal cases show.

Facts checked 13 November 20265 min readHow we research

No Australian law we found stops a person from taking prescribed CBD (cannabidiol) and holding a job. Workplace drug tests look for THC, not CBD. The difficulty is that many CBD products contain some THC, a test cannot tell where THC came from, and reported tribunal cases suggest a prescription does not automatically protect a worker who tests positive.

This page describes how testing and workplace rules operate. It is general information, not legal advice. A union, a community legal centre or the Fair Work Ombudsman can advise on your own situation.

What do workplace drug tests look for?

Most Australian workplace testing follows one of two standards. Urine testing under AS/NZS 4308:2023 targets THC-COOH, the substance the body turns THC into. Saliva (oral fluid) testing under AS/NZS 4760:2019 targets THC itself.123 CBD is not a target in either standard’s drug classes.2 The standards are paywalled, so these details come from testing-industry summaries.

That means the question for a worker is not “am I taking CBD?” but “how much THC is in my product?”

  • A Schedule 4 “CBD-only” medicine must be at least 98% CBD by cannabinoid content. The remaining 2% can include a little THC.4
  • “CBD-dominant” and most full-spectrum products are Schedule 8 controlled drugs and contain more.4
  • In a controlled study, pure CBD caused no confirmed positive urine tests, but CBD-dominant cannabis with a small amount of THC did in two of six people.5

Will CBD show up on a drug test? covers the studies and cut-off levels in full.

Does a prescription protect you if you test positive?

Not automatically. We have not read the tribunal decisions themselves. The pattern below comes from union and employer-association reports of Fair Work Commission cases, and it should be read with that caution.

  • A prescription did not excuse a positive result under a cut-off-based policy. In a 2024 case, the dismissal of a worker who used prescribed medicinal cannabis and tested positive was upheld.6
  • Not disclosing the medicine counted against the worker.6
  • Employers lost when their process was unfair. In a 2025 Full Bench decision ([2025] FWCFB 69), a council worker had told the employer about a CBD prescription and later moved to a product containing THC. The dismissal was found to be unfair.7 In another 2025 case, a worker who tested positive for THC was awarded compensation where site policies conflicted.8

These cases involved THC. We found no reported case about a worker taking a CBD-only medicine who tested negative for THC. The lesson that carries across is that tribunals look closely at what the written policy says, whether the worker was open about the medicine, and whether the employer acted fairly.

Do you have to tell your employer?

There is no single national rule we can point to, and the answer depends on the job.

Western Australia’s work health and safety regulator addresses it directly in an information sheet. It says a worker “in a role where impairment may present a risk” has “a responsibility to notify your employer that you are taking a prescribed medicinal cannabis product”, so the employer can carry out a risk assessment.9 The sheet covers medicinal cannabis in general, including CBD-only products.

Many workplace drug and alcohol policies also require workers to declare any prescribed medicine that could affect safety. Read your own policy. If it is unclear whether a CBD-only medicine has to be declared, ask in writing, so there is a record of the answer.

What discrimination law requires of an employer when a worker takes a prescribed medicine for a health condition is outside what our research covered. We do not want to guess. A legal service or your union can explain it.

Safety-sensitive work

Testing is one issue. Fitness for work is another. CBD does not cause a high, but it can cause tiredness and drowsiness, more so with alcohol or sedating medicines.9 See CBD side effects and CBD drug interactions.

The Western Australian sheet lists the kinds of work where regulators are most concerned about medicinal cannabis: transport (air, road and rail), construction, mining, exploration and drilling, explosives and mobile plant.9 It also says prescribers should consider work health and safety before prescribing.9

Some occupations have their own medical and drug rules set by a national regulator or an employer, such as aviation, rail safety work, defence, policing and heavy vehicle driving. We did not research each of these and cannot state their positions on CBD. If you work in one, ask the regulator or your employer’s medical officer before you start any cannabis medicine.

If your job involves driving, the road law applies as well as the workplace policy. See CBD and driving.

If you are prescribed a cannabis medicine: a short checklist

  1. Read your workplace drug and alcohol policy, including what it says about prescribed medicines and what kind of test is used.
  2. Ask your prescriber whether the product is Schedule 4 (CBD-only) or Schedule 8, and how much THC it contains.
  3. Ask the pharmacy for the batch certificate of analysis.
  4. Tell your prescriber what your job involves, including driving, machinery and shift work.
  5. Keep a copy of your prescription. It may not be a defence, but it shows the medicine was lawfully supplied.
  6. If you are unsure whether to disclose, get advice from your union or a legal service first.

What we could not confirm

  • The exact text and cut-off levels in the two testing standards (they are paywalled).
  • The full citations and reasoning of the tribunal cases other than [2025] FWCFB 69.
  • Rules for specific regulated occupations.
  • How discrimination law applies to prescribed CBD.

Footnotes

  1. Standards Australia. AS/NZS 4308:2023, Procedures for specimen collection and the detection and quantification of drugs in urine. https://store.standards.org.au/product/as-nzs-4308-2023 ↩

  2. Alcolizer Technology. What are the Australian Standard drug class screening cut-off levels? (industry summary of the standards). https://alcolizer.com/what-are-the-australian-standard-drug-class-screening-cut-off-levels/ ↩ ↩2

  3. Australasian Mine Safety Journal. Saliva drug testing standards (industry summary of AS/NZS 4760:2019). https://www.amsj.com.au/saliva-drug-testing-standards/ ↩

  4. Australian Government. Therapeutic Goods (Poisons Standard, October 2026) Instrument 2026. https://www.legislation.gov.au/F2026L01327/asmade/2026-09-30/text/original/pdf ↩ ↩2

  5. Controlled study of urine drug test results after oral and vaporised pure CBD and vaporised CBD-dominant cannabis. Journal of Analytical Toxicology. https://pubmed.ncbi.nlm.nih.gov/31682266/ ↩

  6. Victorian Trades Hall Council, OHS Reps. Worker lawfully dismissed for medicinal cannabis use. https://www.ohsrep.org.au/regulator_news_sn_730_worker_lawfully_dismissed_for_medicinal_cannabis_use ↩ ↩2

  7. Victorian Trades Hall Council, OHS Reps. Council’s cannabis appeal fails (reporting [2025] FWCFB 69). https://www.ohsrep.org.au/council_s_cannabis_appeal_fails_sn_762 ↩

  8. Australian Resources and Energy Employer Association. THC-positive operator wins $40k: site policies clash, 2025. https://www.areea.com.au/help/mining-reform/mining-publications/thc-positive-operator-wins-40k-site-policies-clash/ ↩

  9. Government of Western Australia, WorkSafe. Medicinal cannabis in the workplace: information sheet, 2025. https://worksafe.wa.gov.au/system/files/documents/2025-01/BR_MedicinalCannabis_0.pdf ↩ ↩2 ↩3 ↩4

Common questions

Can I be sacked for a positive drug test if I have a prescription?

Possibly. Secondary reports of Fair Work Commission decisions describe at least one dismissal being upheld where a worker with a prescription tested positive for THC under a workplace policy. Other workers have won because the employer did not follow a fair process. Outcomes turn on the policy, the role and what the worker disclosed.

Do I have to tell my employer I am prescribed CBD?

It depends on your role and your workplace policy, and we cannot give you a legal answer. Western Australia's work safety regulator says workers in roles where impairment may present a risk have a responsibility to notify their employer about prescribed medicinal cannabis. In reported tribunal cases, non-disclosure has counted against workers.

Will CBD oil make me fail a workplace drug test?

Workplace tests do not look for CBD. They look for THC in saliva or its breakdown product in urine. A CBD-only medicine can lawfully contain a trace of THC, and full-spectrum or CBD-dominant products contain more, so a positive result is possible depending on the product.

Can I use CBD if I work FIFO or in mining?

We found no rule that bans CBD itself, but mining and other safety-critical work usually involve regular testing for THC and strict site policies. Western Australia's safety regulator lists mining, transport and construction among the areas of concern for medicinal cannabis. Check your site policy, and tell any prescriber what your job involves.

This page is general information, not medical or legal advice. Laws and evidence change; we show the date we last checked the facts at the top of every page. Talk to your doctor or pharmacist before starting, stopping or changing any medicine.

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