For Australian employers, the Fair Work Commission (FWC) is the ultimate test of whether a workplace drug and alcohol testing program is fair, reasonable, and properly implemented. Unfair dismissal cases involving drug test results provide a body of practical guidance that every organisation should understand — whether you are building a new program or reviewing an existing one.

This article examines the key themes and lessons emerging from FWC decisions, and what they mean for your testing program.

The Legal Framework

When an employee is dismissed following a positive drug test and lodges an unfair dismissal claim, the FWC considers whether the dismissal was harsh, unjust, or unreasonable under section 387 of the Fair Work Act 2009. The Commission examines several factors:

• Whether there was a valid reason for the dismissal.
• Whether the employee was notified of that reason and given an opportunity to respond.
• Whether the employer had a clear, communicated policy.
• Whether the policy was consistently applied.
• The employee’s length of service and disciplinary history.
• Any mitigating circumstances.

Critically, the existence of a positive drug test alone does not guarantee that a dismissal will be found to be fair. The process surrounding the test — before, during, and after — is subject to equal scrutiny.

Lesson 1: Your Policy Must Be Clear and Communicated

One of the most consistent themes across FWC decisions is the importance of having a clearly written drug and alcohol policy that has been effectively communicated to all employees.

Cases where employers have struggled include those where:

• The policy was vague about consequences — stating that a positive result “may” lead to disciplinary action without specifying the range of possible outcomes.
• The policy existed but was buried in an intranet that employees rarely accessed.
• New versions of the policy were introduced without adequate notification or training.
• The employee could not recall receiving or signing the policy, and the employer had no record of acknowledgement.

The practical takeaway is straightforward: maintain signed acknowledgements from every employee, conduct regular awareness training, and ensure your policy is specific about the consequences of a positive result or a refusal to test.

Lesson 2: The Testing Process Must Be Procedurally Sound

The FWC has scrutinised the testing process itself in numerous decisions. Procedural deficiencies that have led to dismissals being overturned include:

• Chain of custody failures. Where the handling of a specimen could not be verified from collection through to analysis, the integrity of the result was called into question.
• Non-compliant collection. Tests not conducted in accordance with AS/NZS 4308 (urine) or AS 4760 (oral fluid) have been given reduced evidentiary weight.
• No confirmation test. Relying solely on a screening result (which can produce false positives) without laboratory confirmation testing has been found to be insufficient as a basis for termination.
• Collector qualifications. The training and certification of the person conducting the test may be examined.

Every step of the testing process is a potential point of challenge. Maintaining detailed records of each test — including the collector, the device used, the time, the conditions, and the chain of custody — is essential.

Lesson 3: The Response Must Be Proportionate

Automatic termination policies — sometimes referred to as “zero tolerance” — have received mixed treatment by the FWC. While the Commission has upheld dismissals under such policies in safety-critical industries, it has also found dismissals to be disproportionate where:

• The employee was in a low-risk role with no immediate safety implications.
• The employee had a long and unblemished service record.
• The positive result was at a low level, and there was no evidence of impairment.
• The employer did not consider alternatives to termination, such as a final warning, counselling, or reassignment.

The lesson is not that zero-tolerance policies are invalid, but that they must be applied with consideration of the specific circumstances. The FWC expects employers to exercise judgment, not simply follow a formula.

Lesson 4: Give the Employee an Opportunity to Respond

Procedural fairness requires that an employee be informed of the positive result and given a genuine opportunity to respond before any decision is made. This is not a formality — it is a substantive requirement.

Responses that employees may raise include:

• A valid prescription for a medication that triggered the positive result (e.g., medicinal cannabis, codeine-based painkillers, or benzodiazepines).
• Passive exposure or contamination (though this defence is rarely successful at the levels detected in confirmed tests).
• Personal circumstances that may constitute mitigating factors.
• Challenges to the testing procedure or chain of custody.

The employer must genuinely consider these responses. A “show cause” meeting that is conducted as a mere formality, with the outcome predetermined, is unlikely to satisfy the FWC.

Lesson 5: Consistency Is Critical

Inconsistent application of a drug and alcohol policy is one of the fastest ways to lose an unfair dismissal case. If one employee receives a final warning for a positive result while another is terminated for the same offence under the same policy, the terminated employee has strong grounds for a claim.

Common consistency failures include:

• Different outcomes at different sites or under different managers.
• Senior employees receiving more lenient treatment than junior staff.
• Contractors being treated differently from permanent employees without a policy basis for the distinction.

Maintaining a centralised record of all testing outcomes and disciplinary decisions — rather than leaving these to individual managers or sites — is the most effective way to ensure consistency.

Lesson 6: Documentation Wins Cases

Across virtually every FWC decision involving drug testing, the quality of the employer’s documentation has been a decisive factor. Employers with thorough records — of the policy, its communication, the testing process, the result, the disciplinary process, and the decision — are in a far stronger position than those relying on recollection or incomplete files.

Key documents to maintain include:

• Signed policy acknowledgements.
• Training records.
• Selection event records (pool, method, date, outcomes).
• Test records (collector, time, location, device, chain of custody, result).
• Correspondence with the employee (show cause letters, meeting notes, decision letters).
• Records of any prior incidents or warnings.

Building a Defensible Program

The common thread across FWC decisions is that a defensible drug and alcohol testing program is not just about catching positive results. It is about building a fair, transparent, and well-documented system that can withstand external scrutiny.

This means investing in:

• A clear, current, and regularly communicated policy.
• Testing procedures that comply with Australian Standards.
• A genuinely random and auditable selection process.
• Consistent application across all employees and locations.
• Comprehensive, secure, and accessible record-keeping.

If your current system makes any of these difficult — particularly around record-keeping, audit trails, and selection integrity — it may be time to consider a purpose-built solution.

FairTest is designed to support every element of a legally defensible testing program, from verifiable random selections to immutable test records and on-demand compliance reports. Start your free trial and ensure your program is ready for scrutiny.