Drugs in road traffic – Driving under the influence of drugs

Drug use and driving under the influence of drugs are far from harmless offences. In addition to serious health risks, drugs behind the wheel have a severe impact on driving ability and on the safety of all road users. Even small amounts of certain substances can significantly impair perception, reaction time and judgement.

Police roadside drug check in Switzerland

Did you know? In Switzerland, the consumption of drugs, alcohol and medication is among the most common causes of serious and fatal road traffic accidents.

Why are drugs particularly dangerous when driving?

Psychoactive substances affect the central nervous system. Depending on the substance, they may cause fatigue, euphoria, anxiety, overconfidence or slowed reactions. In road traffic, these effects can have fatal consequences.

  • delayed reaction times
  • impaired perception of speed and distance
  • increased risk-taking and misjudgement
  • coordination and concentration problems

What makes this particularly deceptive is that even if a person feels fit to drive, their actual driving performance may already be significantly reduced.

Which substances are most commonly detected in road traffic?

Although the number of psychoactive substances continues to grow, roadside checks repeatedly reveal similar groups of drugs. The most commonly detected substances include:

  • cannabis (THC)
  • amphetamines and methamphetamine
  • cocaine
  • MDMA (ecstasy)
  • opiates and opioid-based medications (e.g. morphine)
  • benzodiazepines and other sedative drugs

Even legally prescribed medication can significantly impair driving ability, especially when combined with alcohol or other substances.

What penalties apply for driving under the influence of drugs?

In Switzerland, driving under the influence of drugs constitutes a serious offence under road traffic law. The consequences are usually severe and go far beyond a simple fine.

Driving licence withdrawal – for how long?

  • At least 3 months for a first positive result
  • At least 12 months in case of a repeat offence within 5 years
  • At least 2 years after three offences within 10 years
  • Indefinite withdrawal if another offence occurs after a two-year ban

In addition, substantial fines, high procedural costs and – in severe cases – a custodial sentence may be imposed.

How does drug use affect insurance coverage?

If a traffic accident occurs under the influence of drugs, insurance companies may reduce benefits or claim recourse if the driver is found to be unfit to drive.

Depending on the extent of the damage, costs can amount to tens of thousands of Swiss francs or even hundreds of thousands or millions – expenses that may ultimately have to be borne personally.

Rapid drug tests during roadside checks

During roadside checks, police increasingly rely on rapid drug screening tests to quickly assess an initial suspicion. These tests provide a first on-site indication without the need for immediate laboratory analysis.

Saliva drug tests are particularly well established, as they are easy to use and can detect recent impairment. Positive screening results are usually confirmed by laboratory analysis.

Prevention: responsibility saves lives

Responsible drug use also means consistently refraining from driving. Anyone who has consumed drugs – regardless of whether the substance is legal or illegal – should always use alternative means of transport.

Prevention not only protects your own health, but also the lives of other road users.