New study aims to create a roadside marijuana impairment test
NCT ID NCT05115513
First seen Nov 01, 2025 · Last updated Jun 19, 2026 · Updated 38 times
Summary
This study, completed by Yale University, tested whether a standardized field test can measure marijuana impairment in drivers. 41 participants who use marijuana regularly completed cognitive tasks and simulated driving after smoking either medium-THC or placebo marijuana. The goal is to develop a reliable test for police to use on the road.
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This is a summary of
the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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Olin Neuropsychiatry Research Center
Hartford, Connecticut, 06106, United States
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Marijuana flower with medium THC
What this could lead to
If successful, this could lead to a reliable roadside test for marijuana impairment, helping improve road safety.
What could go wrong
This is a small, early-phase study (41 participants) that only looks at lab-based tasks, not real driving. Results may not translate to real-world conditions or different populations.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.