The handling of drugs and drug tests is clearly regulated by law in Switzerland. Whether in road traffic, at work or in the private sphere: The legal situation differs significantly depending on the context. This page provides you with a neutral, understandable overview of the most important legal bases in Switzerland.
Note: This page does not constitute legal advice, but summarizes applicable principles in a generally understandable way.
1. Road traffic (CH)
In road traffic, it is not the rapid test that decides, but the blood values.
Procedure for inspection:
- Screening (saliva / pre-test)
- Suspicion confirmed → blood sample
- Laboratory analysis (LC-MS/MS)
- Evaluation based on active ingredients
THC limit in Switzerland
-
1.5 μg/L active THC (serum) → unfit to drive, criminally relevant
Zero Tolerance:
Cocaine, amphetamines, methamphetamine, MDMA, heroin/morphine (without prescription)
2. Workplace
Drug testing is only allowed if:
✔ Security-related activity
✔ reasonable suspicion
✔ Clear internal guidelines
✔ Data protection complied with
✔ Consent available
Not allowed:
- Groundless tests in the office area
- pure curiosity
- Tests without consent
In case of positive screening:
→ always require laboratory analysis
3. Private use
Drug tests may be used privately:
✔ for self-control
✔ in the case of minor children (duty of supervision)
✔ for prevention in the environment
Inadmissible:
- Secret testing of adults
- Sample manipulation
- Compulsory tests
The following always applies: Personality and data protection law (DSG / ZGB).
4. Confirmatory analysis (laboratory)
A rapid test alone does not create a legal obligation.
The only legal validity is:
- LC-MS/MS Laboratory Analysis
- Precise determination of active ingredients
- No cross-reactions
- Legally binding
Only then are measures, penalties, or labor law steps possible.
Data Protection & Documentation
The following apply to testing:
- Purpose limitation of data
- Access only for authorized persons
- no disclosure without consent
- Define deletion deadlines
Transparent communication is mandatory.
