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Study reveals how booze and weed mess with your driving

NCT ID NCT02709954

Knowledge-focused Sponsor: Yale University 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 This study
Running, but no longer taking on new participants.
Completed
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Updated 1 time

Summary

This study looks at how alcohol and cannabis, alone or together, affect driving and thinking. About 40 occasional users aged 21–55 will take part. They will inhale low-dose THC (like a quarter of a joint) and drink alcohol, then test their driving on a simulator and complete questionnaires. The goal is to better understand the risks of driving under the influence.

What this could mean

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

Active substance
delta-9-THC and ethanol
What this could lead to
If successful, this study could help understand how alcohol and cannabis together impair driving, informing safety guidelines and public policy.
What could go wrong
This is a small, early-phase study with only 40 participants, so results may not apply to everyone. It uses a driving simulator, not real roads, and focuses on occasional 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

Phase 1

The first testing in people. Mainly checks safety and dose, usually in a small group.

Participants

About 40 people

The number the study aims to enrol. It can still change while the study runs.

Start date

Mar 2016

Expected to finish

Dec 2026

An estimate. End dates often move.

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 to 55 years

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: * Males or females 21 to 55 years of age (extremes included). * Occasional current cannabis users. * Experience with drinking 2 or more standard drinks of alcohol at least once in lifetime. * Able to provide informed consent. Exclusion Criteria: * Cannabis naïve. * Alcohol naïve. * Positive pregnancy screen * Hearing deficits.

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Conditions

The condition(s) this trial relates to.

cannabis dependence

As listed by the trial registrant

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

Alcohol effect Cannabis Driving under the influence of alcohol and other drugs

Contacts and locations

Locations

  • Biological Studies Unit, VA Connecticut Healthcare System

    West Haven, Connecticut, 06516, United States

More trials for these conditions

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