A new study is shedding light on the interaction between cannabis edibles and alcohol, finding that combining the two substances can cause greater and longer-lasting driving impairment than either substance alone. The study also reveals that cannabis edibles do not significantly impair performance on standard field sobriety tests, but participants were only identified as intoxicated at the highest alcohol dose tested.
THURSDAY, May 7, 2026 — A new study is raising questions about what roadside sobriety tests actually detect — and what they might miss.with edible cannabis products, yet controlled research has largely focused on smoked cannabis," said principal investigator Tory Spindle, an associate professor of psychiatry and behavioral sciences at Johns Hopkins University School of Medicine in Baltimore.
During multiple experiments, 25 healthy adults between 21 and 55 years of age, were given either pot-infused brownies, alcohol, bothThe first major finding: Combining edibles with alcohol caused greater and longer-lasting driving impairment than did either substance alone. Increased impairment occurred even at alcohol levels below the legal limit of 0.08%. The second major finding: Cannabis edibles — either alone or combined with alcohol — did not significantly impair performance on standard field sobriety tests.
Participants were only identified as intoxicated at the highest alcohol dose tested.
"This is the first controlled study to examine how cannabis edibles and alcohol interact, despite their growing combined use," Spindle said. Get the facts on prescription drug abuse. Learn to spot the warning signs of abusing common prescription drugs and learn about treatment options for pill addiction.
Roadside Sobriety Tests Cannabis Edibles Alcohol Driving Impairment Standard Field Sobriety Tests
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