People aren’t test results: prescribed medication and workplace drug testing

Workplace drug testing and workplace safety go hand in hand. Testing protects the safety of employees and helps employers manage risk and make informed decisions.

However, it is not as simple as negative or positive results. One of the biggest challenges facing workplace drug testing processes today is prescribed medication. With the use of medicines like medicinal cannabis, sleeping tablets and ADHD medication rising, balancing safety, privacy and a fair process is not easy for workplaces.

This is the new reality for employers, so how do they find the right balance?

Because workplaces involve real people with real health needs, human‑centred drug testing is one of the keys. It ensures decisions consider context and respect the importance of medication disclosure at work, rather than relying only on a test result.

A non‑negative drug test result isn’t the whole story

It’s 2am at a mining operation and random drug testing is underway in the processing plant. The testing consultant has already screened several workers without issue. Then one of the employees provides a non‑negative drug test result. In other words, the initial screen has detected that a substance may be present in the sample.

It’s not a common occurrence, and it creates an immediate ripple of concern. The supervisor feels a spike of pressure. It’s the middle of the night, production is running, and they need to make safe decisions quickly. The employee, who is an excellent worker, suddenly feels anxious. They worry about stigma, misunderstanding or being judged before anyone knows the full story.

At times like this, it’s important to take a breath and rely on policies and procedures.

The most important thing following a non-negative result is the safety of the employee and their colleagues. This means taking the employee away their role and to a safe area.

Secondly, no conclusions or assumptions are made. A non‑negative result is only an initial screen. It does not confirm impairment and it does not determine fitness for work. It is simply a signal that more information is needed.

This is why confirmation testing matters. Another sample will need to be sent to a laboratory for detailed analysis. The lab will identify the exact substance and its concentration. This protects both the employee and the employer. Decisions are based on verified information, not assumptions made at 2am under pressure.

Prescribed medication could be the reason for the non‑negative result

The supervisor and employee at the mine site go back to the break room and have a discreet discussion.

The employee is embarrassed but believes they can explain the non‑negative result. They are taking prescribed medication for ADHD. They have been on it for months and have never had issues performing their role. They had thought about disclosing their medication but didn’t know how to raise the topic with their supervisor.

This is a typical scenario. In this case it was ADHD medication, but it could have been medicinal cannabis for chronic pain, opioid pain relief after an injury, or sleeping tablets to help with insomnia. These medicines can appear in screening tests even when the employee is taking their medication as prescribed and even when they are fit for work.

That doesn’t mean everything is perfectly fine, however. Prescribed medicines affect people differently. Some employees may be fully fit for work while undertaking long‑term treatment. Others may be adjusting to a new dose or experiencing side effects. Because of this, encouraging employees to disclose that their taking prescribed medication that could be a concern is vital.

Supervisors and manager should understand that prescribed medicines are part of modern healthcare. Employees should feel safe to disclose medication without fear of unfair judgement. When both sides approach the conversation respectfully, workplaces make better decisions—even at 2am on a busy shift.

What happens when an employee makes a medication disclosure at work?

When an employee shares information about prescribed medication, several practical steps can follow. These steps support safety, privacy and fairness.

• Clarify the safety risk — Determine whether the medication could affect the employee’s ability to perform safety‑critical tasks. For example, operating machinery or driving may require additional assessment.
• Seek professional guidance — Employers should avoid making medical assumptions. A qualified practitioner can provide advice on whether the employee is fit for work.
• Maintain confidentiality — Medication disclosure at work involves private health information. It must be stored securely and shared only with those who need to know.
• Apply fair and consistent process — Employees should understand what happens next. For example, whether temporary modified duties are required.
• Focus on support, not punishment — When employees feel supported, they are more likely to engage openly. This leads to better safety outcomes and healthier workplaces.

These steps recognise that workplaces are made up of people, not test results. They help employers manage risk while respecting the dignity and wellbeing of their workforce.

Why human‑centred drug testing protects health

Human‑centred drug testing strengthens workplace safety. It recognises that workers have medical needs, personal circumstances and responsibilities outside of work. It also recognises that workplace harm affects families, businesses and communities.

When employers combine reliable testing with fair process, they protect more than compliance. They protect people’s health, confidence and future.