This research is being done to measure the effects of both oral and vaporized cannabis (marijuana), at different doses, on the ability to perform certain tasks such as balancing, eye tracking, and computerized measures of memory and attention, as well as performance on a novel app (DRUID) that is being developed for field sobriety testing. The investigators will collect biological fluids (urine, blood, saliva/spit) after cannabis is eaten or vaporized to see if there are markers in those fluids that can predict performance on the behavioral tasks and the DRUID App. The results of this study will help us better understand the effects of using cannabis, and to help identify behaviors and/or substances in the body that relate to cannabis impairment.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Enrollment
23
Cannabis will be self-administered by study participants
Johns Hopkins University School of Medicine
Baltimore, Maryland, United States
Tetrahydrocannabinol (THC) Concentration in Blood
Quantitation of active drug (THC) in whole blood (ng/ml).
Time frame: 8 hours
11-hydroxy-tetrahydrocannabinol (11-OH-THC)
Quantitation of THC metabolite in blood (ng/ml)
Time frame: 8 hours
Tetrahydrocannabinolic Acid (THCCOOH)
Quantitation of THC metabolite in blood (ng/ml).
Time frame: 8 hours
Change in Heart Rate
Peak change from baseline
Time frame: Baseline, 1, 2, 3, 4, 5, 6, 7, and 8 hours post drug exposure
Mean (SD) Peak Change-from-baseline Drug Effect Rating
Subjective rating of drug effect (0-100) at peak effect: between 2 and 5 hours for oral dosing conditions and 0 and 2 hours for vaporized conditions. Higher numbers mean stronger drug effects, where 0 means no drug effect and 100 means extremely strong drug effect.
Time frame: Up to 5 hours
Change From Baseline Behavioral Task Performance as Assessed by the DRUID App Score
Composite Global Impairment Score on the DRUID (DRiving Under the Influence of Drugs) App, a measure of behavioral task performance (range 0-100) where lower scores indicate better performance. ≥13-point change (from baseline) on DRUID global impairment score = "impaired"; \<13-point change (from baseline) = "not impaired".
Time frame: 8 hours
Peak Change in Blood Pressure
Systolic and Diastolic blood pressure will be measured at baseline and repeatedly for 8 hours after drug exposure. Outcome is the peak change from baseline assessed within the 8 hour period of assessment.
Time frame: 8 hours post drug exposure
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