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New study tests High-Tech car sensors to spot stoned drivers

NCT ID NCT07401628

Knowledge-focused Sponsor: University of Bern Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jul 21, 2026 · Updated 4 times

Summary

This study aims to see if sensors inside a car can tell when a driver is impaired by cannabis. Forty-five healthy adults who regularly use cannabis will drive on a closed track after smoking a controlled dose of THC. Their driving behavior, eye movements, and other data will be compared to sober driving to train a computer model to detect impairment.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Cannabis (THC)
What this could lead to
If successful, this could lead to a real-time in-vehicle system that alerts drivers when they are too impaired to drive safely after cannabis use.
What could go wrong
This is a small, early-stage study with only 45 participants on a closed track, so results may not apply to real-world driving or all cannabis users.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

45 people

The number who actually took part.

Started

Jan 2026

Finished

Jul 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

21 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Informed consent as documented by signature * Recreational cannabis-consumption (more than once per month) * In possession of a definite Swiss or European Union (EU) driving license * At least 21 years old * Active, regular driving a car in the last 6 months * Must be in good health condition * No special equipment needed when driving (special seats, levers, etc.) * Fluent in (Swiss) German and no speech impairment Exclusion Criteria: * Health concerns where cannabis consumption is contra-indicated (such as: high blood pressure, psychiatric problems (e.g. psychosis, depression, attention-deficit conditions, etc.) * Cannabis-abstinence or excessive consumption, , assessed using the Cannabis Use Disorders Identification Test-Revised (CUDIT-R) * For women: pregnancy or breastfeeding or if intention to become pregnant during study period (time between telephone screening and study day (visit 2) * Alcohol misuse or excessive alcohol consumption habits/risky drinking behaviour, assessed using the Alcohol Use Disorders Identification Test (AUDIT) and/or phosphatidylethanol (PEth) in capillary blood \> 200 ng/mL at first visit * If breath alcohol test is positive at Visit 1 or Visit 2 (study day) * Consumption of drugs of abuse (others than cannabis) within 4 weeks before the study * Consumption of medications / pharmaceutical drugs which interfere with driving ability * Inability to follow the procedures of the study, e.g., due to language

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Conditions

The condition(s) this trial relates to.

Driving Under the Influence

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Cannabis-impaired driving Driving under the influence

Contacts and locations

Locations

  • Institute for Forensic Medicine, Forensic Chemistry and Toxicology University of Bern

    Bern, 3008, Switzerland

More trials for these conditions

Other studies related to the condition(s) this trial covers.