Random drug testing – how to build a legally sound programme
When random checks are defensible, how selection and frequency should be designed, and how the programme holds up in the Swedish Labour Court.
Random drug testing is one of the most effective tools for keeping a workplace drug-free – both preventively (knowing that a test may come discourages use) and reactively (actual detections). But the programme must be designed correctly to hold up legally. For the basics of the employer's right to test, read our guide on the employer's right to drug test.
When are random checks defensible?
Random checks are more controversial than suspicion-based testing because they lack an individual reason. The Swedish Labour Court (Arbetsdomstolen) has accepted random programmes when:
- There is a clearly defined safety risk in the work
- The programme is grounded in a communicated policy
- MBL negotiation has been carried out
- The selection method is genuinely random
- Frequency and scope are proportionate
Industries where it is common
Random checks are standard practice in:
- Heavy transport and commercial traffic (ADR, haulage companies, taxis)
- Construction and civil engineering
- Warehousing and logistics
- Process and manufacturing industry
- Healthcare in safety-sensitive roles (surgical and anaesthesia staff)
The selection method must be random
"Random" is not the same as "whenever the manager feels like it". The programme should use a documented selection method – often a digital draw based on the HR system. Manual selection where the manager singles out individuals is problematic because it opens the door to suspicions of discrimination.
Frequency
There is no statutory level, but common set-ups are:
- Low risk: 5–10% of staff per year
- Medium risk: 25% per year
- High risk: 50%+ per year, sometimes monthly spot checks
The frequency is calibrated against risk and industry. Provsvaret helps you find the right level.
Who is included in the selection?
The programme should clearly define which roles are covered. "All employees" is often disproportionate; "everyone in safety-critical roles" or "everyone required to hold a driving licence for their job" is often right. The definition should be set out in the policy.
Implementation
When someone is selected: notification is given on the day of the test, so the employee does not have time to prepare. The time from notification to sample collection should be as short as possible – often within 1 hour. The test takes place during working hours, is paid, and follows the same chain of custody as all other samples.
Refusal to take a test
Refusal is handled in accordance with the policy – usually treated as equivalent to a positive result. This must be clearly stated in the policy to be defensible.
Communication to employees
Random programmes are least controversial when employees know they exist. Provide information:
- On recruitment – as part of onboarding
- As an annual reminder, e.g. in connection with performance reviews
- At incidents – when the policy becomes relevant
Set up a programme
Provsvaret helps you set up random programmes from the ground up – selection method, frequency, communication and ongoing implementation. Book a call and we will go through your circumstances, or read more about our analyses for workplace testing.
Want to know more?
Contact us for personalized advice on drug testing and how we can help your organization.
