With-Cause Drug & Alcohol Testing
Maintaining a safe and productive workplace requires more than just policies — it requires the ability to act when concerns arise.
With-cause drug and alcohol testing, also known as reasonable suspicion testing or For-cause testing, allows organisations to respond quickly and appropriately when there is an urgent need for testing (rather than the pre-planned pro-active approach of random testing for example).
By addressing potential risks in real time, with-cause testing plays a critical role in protecting employees, maintaining safety standards, and supporting responsible workplace practices.
What Is With-Cause Testing?
With-cause testing is carried out when there is a reasonable belief that an employee may be impaired while at work.
This may be based on:
- Observable behaviour (e.g. unsteadiness, confusion, changes in mood)
- Physical signs (e.g. smell of alcohol, slurred speech)
- Involvement in a workplace incident or near miss
- Reports or concerns raised by colleagues or supervisors
Unlike random testing, with-cause testing is reactive, allowing employers to take immediate action when a potential risk is identified.
- Protecting Workplace Safety
The primary purpose of with-cause testing is to reduce risk.
If an employee is impaired, particularly in safety-critical roles, it can significantly increase the likelihood of accidents, injuries, or damage to equipment.
By acting quickly, employers can prevent incidents before they escalate.
- Supporting Fair and Responsible Decision-Making
With-cause testing provides an objective way to assess situations where impairment is suspected.
Rather than relying solely on observation or assumption, testing helps ensure that decisions are based on evidence. This supports fair treatment of employees while protecting the wider workforce.
- Strengthening Compliance and Duty of Care
Employers have a responsibility to provide a safe working environment, in line with guidance from the Health and Safety Executive [1], organisations are expected to manage workplace risks, including those associated with drug and alcohol misuse, to protect health, safety and welfare of employees and others who may be affected by their activites.
With-cause testing supports this duty of care by demonstrating that appropriate steps are taken when risks arise, helping organisations meet health and safety obligations.
- Reducing the Risk of Repeat Incidents
Where substance misuse is identified, appropriate action can be taken to manage the situation.
This may include:
- Internal procedures
- Support pathways
- Monitoring or follow-up testing
Addressing issues early can help reduce the likelihood of future incidents.
The Importance of Rapid Response
Timing is critical in with-cause testing.
Many substances remain detectable for a limited period, meaning delays in testing can reduce the likelihood of accurate detection.
A rapid response ensures:
- Testing is carried out as close to the time of concern as possible
- Results more accurately reflect the situation
- Employers can act quickly and confidently
At Randox Testing Services, we understand the importance of acting quickly. In 2025, we achieved a 98% on-time arrival rate for 2-hour with-cause call-outs, ensuring organisations can respond promptly when concerns arise.
Having access to a fast and reliable call-out service is essential for maintaining the integrity and effectiveness of a with-cause testing programme.
Why Professional Sample Collection Matters
In situations involving potential impairment, the testing process must be handled carefully and professionally.
Key considerations include:
- Accurate identification of the donor
- Precise sample collection procedures
- Secure handling and documentation
- Maintaining chain of custody
Using trained and impartial collection officers helps ensure that results are reliable, consistent, and suitable for supporting workplace decisions.
Contact Us
Randox Testing Services routinely supports organisations with with-cause drug and alcohol testing, helping employers respond quickly and effectively when concerns arise in the workplace.
By providing a fast, reliable and professional service, with rapid call-out response times, we help organisations manage risk, support compliance, and maintain safe working environments.
If you would like to learn more about with-cause drug and alcohol testing, contact us today:
Email: testingservices@randox.com
Phone: +44 (0) 28 9445 1011
LinkedIn: Randox Testing Services
Learn more about our services at: Randox Drug & Alcohol Testing Services
References
- Health and Safety Executive (HSE), Drug misuse at work: guidance for employers. Available at: https://www.hse.gov.uk/alcoholdrugs/