Here you will find frequently asked questions about drug use, drug tests, risks and legal aspects in Switzerland. This page is designed as an overview: you can jump directly to the situation that applies to you and then explore the topic in more detail if needed.
Quickly find the right question:Note: The content is for general information only and does not replace medical or legal advice.
Assess the situation
Is the person currently under the influence of drugs?
How to recognise possible signs — and why it is important not to jump to conclusions, even if you have a suspicion.
Read the articleWere drugs used over the weekend?
Guidance on detection windows, influencing factors and common misunderstandings related to rapid tests.
View the questionUnderstand drug tests
What is the advantage of a saliva drug test over a urine drug test?
Differences in detection windows, the meaning of results and typical situations where each test type is used.
See the comparisonHow reliable are rapid drug tests?
What rapid tests can show — and what they cannot guarantee: screening, confirmation and typical sources of error.
Read the explanationWhat are cross-reactions in drug tests?
Why certain medications or substances can influence a screening test — and how to interpret results correctly.
Learn moreCan a drug test be positive because of passive smoking?
What is realistic, which factors play a role — and where the most common myths come from.
View the answerCBD vs. THC: when can a drug test become positive after CBD use?
What matters with CBD products: residual THC, frequency of use, test type — and how to reduce risks.
Read the articleMedications & everyday life
Can painkillers make a drug test positive?
Which active substances may be relevant, what cross-reactions mean and when laboratory confirmation is useful.
Read the articleBenzodiazepines & sleeping pills: risks, dependence and detectability
What you should know about effects, combined use, withdrawal risks and testing — explained clearly and concisely.
Read the articleSubstances, cutting agents & purity
Drug cutting agents & drug purity
Why cutting agents can be risky, what is commonly found — and why a “pure” product is not automatically safe.
View the overviewHow pure is the cocaine or heroin I consume?
Guidance on purity, risks and why subjective effects are not a reliable indicator of drug purity.
View the questionQuestions about opioids and opiates
Effects, risks, detectability and common uncertainties — explained in a compact and understandable way.
View the topicChildren, family & social environment
How can I tell if my child is using drugs?
How to interpret warning signs, start a conversation and understand why trust is often more helpful than control.
View the guideSuspected drug use in teenagers: what can parents do without destroying trust?
How parents can respond calmly, start a conversation and find support — without premature judgement.
Read the articleLaw & road traffic
What happens if I refuse a drug test?
The difference between a preliminary test and an official examination — as well as possible consequences in Switzerland.
Read the explanationCriminal record for drug offences in Switzerland: entry, duration & deletion
When an entry may occur, how long it can remain and which legal principles apply in Switzerland.
Read the articleDriving licence withdrawal due to drugs: procedure, duration & what happens next
What may follow after a traffic control — from screening or blood sampling to administrative measures and further assessments.
View the guideCBD and driving in Switzerland: legal aspects & typical risks
Why THC residues can be relevant and how controls and confirmation analyses should be interpreted.
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