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REVIEWED BY ESSENCE DISPENSARY TEAM: Dharni Khatri | Pharmacist

If you’re prescribed medicinal cannabis, you must consider if your workplace/employer has a drug and alcohol policy and if workplace drug testing applies. While medicinal cannabis is a legally prescribed medicine in Australia, your prescription doesn’t exclude you from being tested and drug tests can detect substances such as THC (tetrahydrocannabinol) whether obtained legally or not.

That means a patient can follow their treatment plan and still receive a positive result on a workplace drug test. Understanding how workplace testing works, what a positive result means and how your employer's policy applies can help you prepare.

Please note that this blog article provides general information only and is not legal or employment advice.

Understanding workplace drug testing in Australia

Some Australian employers use workplace drug testing to manage health and safety risks where impairment could put the worker or other people at risk. Common workplace drug tests include:

  • Breath tests only detect alcohol (ethanol) in your system, not other drugs.
  • Urine tests detect drug metabolites (byproducts the body creates when breaking down a drug).
  • Saliva or oral fluid tests detect drugs or their metabolites and are commonly used to assess a recent period of drug use.
  • Blood tests detect substances in the bloodstream over a shorter period.
  • Hair tests detect a wide range of drugs (and chronic alcohol use) over an extended timeframe (typically up to 90 days).

Workplace drug tests commonly involve urine tests and saliva/oral fluid tests and can screen for cannabis or THC.

Importantly, they don’t determine whether you’re impaired i.e. affected by the drug, just that they’re present in the body. And medicinal cannabis patients need to understand those drug tests don’t distinguish whether the cannabis or THC is from prescribed medicinal cannabis or another source, or when the medicine was taken.

How workplace drug and alcohol testing policies work

Employers are obligated to manage workplace health and safety risks. Depending on the level of safety risks, various formal drug and alcohol policies can be implemented including pre-employment tests, random drug tests, post-incident tests, and “reasonable suspicion” tests.

High-risk industries such as transport, mining and construction may be subject to a specific legislation, regulations, codes of practice or industry requirements governing alcohol and other drug use. Employers may also have drug and alcohol policies based on their work health and safety obligations and the risks associated with particular roles. This means medicinal cannabis patients working in safety-sensitive roles need to understand both the relevant laws and their employer's drug and alcohol policy.

Workplace drug and alcohol testing may include:

  • Pre-employment testing as part of employer’s recruitment or onboarding process.
  • Random testing while employed without a specific incident or concern triggering the test.
  • Post-incident testing for a worker involved in a workplace health and safety incident.
  • Reasonable suspicion testing where there’s a reasonable belief that a worker may be affected by alcohol or another drug.

Workplace drug testing services may provide employers with testing and collection processes, but the consequences of a positive result are ultimately determined by the applicable workplace policy, employment arrangements, and specific industry legislation.

Medicinal cannabis and workplace drug testing: what patients should know

This is where medicinal cannabis patients can get confused and stressed if their employer not only has a drug and alcohol policy but also has workplace drug testing in place.

The two key issues for medicinal cannabis patients are:

  1. A positive THC result does not identify why THC is present.
  2. A prescription doesn’t automatically exclude you from workplace drug tests.

A workplace drug test that positively detects THC can’t determine whether the THC came from legally prescribed medicinal cannabis or non-prescribed cannabis use. In other words, the test is detecting the substance or its metabolites—not your prescription’s validity.

A prescription doesn’t automatically exclude you from workplace requirements

Having a prescription means your medicinal cannabis has been legally prescribed and supplied through the appropriate pathway. It doesn’t automatically mean that a workplace must disregard a positive drug test. What happens after a positive result can depend on your employer's drug and alcohol policy, your role’s requirements, your employment arrangements and any legislation applying to your industry.

WorkSafe Queensland advises prescription medication should be considered under workplace risk management and that workers should consider whether medication could affect their ability to work safely.

Your prescribing practitioner can also help you understand how your treatment may affect alertness, concentration, reaction time or other aspects of your ability to work safely.

Detection and impairment are different

One of the most important things to understand about medicinal cannabis and workplace drug testing is that detectable THC does not necessarily mean current impairment.

THC and its metabolites can remain detectable in the body after the immediate effects of cannabis have worn off. The length of time varies according to factors such as the product, dose, frequency of use, and individual metabolism. Read our blog how long cannabis stays in your system to learn more.

The TGA (Therapeutic Goods Administration) gives some general cautions regarding driving and operating machinery while on a medicinal cannabis treatment plan and gives some information about measurable THC concentrations remaining detectable.

Importantly, workplace drug testing should not be confused with roadside drug testing. The legal framework governing driving is different from workplace requirements, and the rules can vary between Australian states and territories.

What medicinal cannabis patients can do

If you use prescribed medicinal cannabis and workplace drug testing is part of your employment, here are some practical steps you can take:

  • Talk to your prescribing practitioner. You can discuss what your job requires in line with your dosing schedule and potential side effects.

  • Understand your workplace policy. Check whether your workplace conducts testing, what type of testing is used, when testing can occur and what the policy says about prescription medication. If you're unsure how the policy applies to your role, ask your HR team or supervisor/manager for clarification.

  • Consider disclosing your medication where appropriate. You’re only required to tell (disclose) your employer about personal medical information when it’s likely to affect the job you’re doing. Ask your prescribing practitioner for a letter, which generally won’t disclose the specifics of your medicine/treatment but give a higher-level context of “receiving treatment that may affect X”. Seek independent employment or legal advice if you're unsure about your situation.

  • Always have your prescription and original packaging with pharmacy labels. This advice applies to all prescription medication, not just medicinal cannabis medication.

  • Get independent advice if a workplace drug test issue arises. If you receive a positive drug tests result and are concerned about disciplinary action, dismissal, discrimination or your employment rights, speak with an appropriately qualified employment lawyer or adviser.

You may find our blogs on legal guide to medical CBD and cannabis laws in Australia and best practices for starting a medical cannabis treatment plan useful.

Frequently asked questions

Can I be drug tested at work if I have a medicinal cannabis prescription?

Yes. It depends on your employer, workplace policy, role and applicable requirements.

If your treatment contains THC, a standard test may detect it. The consequences of a positive result will depend on the circumstances and your workplace/employer policies.

How long does THC stay in your system for a drug test?

There is no single detection window that applies to everyone.

Detection can vary according to the frequency and amount of cannabis used, the individual, the type of product and the type of drug test. Urine, saliva, blood and hair tests can detect cannabis over different periods. To learn more, read our guide to how long cannabis stays in your system.

Importantly, a detection window should not be treated as a guarantee that you’re impaired or not for workplace drug testing or roadside drug testing.

What should I do if I test positive at work while using a valid prescription?

Follow your workplace's testing and review procedures. Consider providing relevant healthcare documentation and speak with your prescribing practitioner about your treatment.

If the result could affect your employment, seek independent employment law advice about your specific circumstances. Your pharmacy or prescribing practitioner can provide information about your medicine and treatment but can’t assist in employment rights matters.

Do I have to tell my employer I'm taking medicinal cannabis?

There isn't one answer that applies to every worker. It depends on your role, workplace policy, employment arrangements and whether your medication could affect your ability to perform your work safely.

For safety-sensitive roles, it’s particularly important to understand what your employer's policy requires and discuss any concerns with your prescribing practitioner. If you're uncertain about your disclosure obligations, seek independent employment advice.

Have questions about medicinal cannabis and workplace drug testing?

Understanding how medicinal cannabis interacts with workplace drug testing can feel complicated, particularly when you're managing a prescribed treatment and trying to meet your workplace's safety requirements.

If you have questions about your medicinal cannabis treatment, dosing, side effects or how your medicine may fit around your daily routine, the Essence Dispensary team can give you pharmacist-led support and help you understand when it's appropriate to speak with your prescribing practitioner.

For questions about whether medicinal cannabis may be appropriate for your individual circumstances, check your eligibility for free here and if eligible book a consult with Essence Dispensary.

This blog article provides general information only and is not medical, employment or legal advice. Workplace requirements can vary between employers, industries and Australian jurisdictions. Always follow your workplace's drug and alcohol policy and speak with an appropriately qualified professional about your individual circumstances.

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