Given the known driving behavior of Driving Under the Influence of Alcohol and some of its parallel to driving under the influence of cannabis, this supplemental study aims to validate the sensitivity of the primary and secondary outcome measures employed in a cannabis and driving study currently in progress.

This study will examine the effects of an intoxicating dose of alcohol on driving-related skills among young drivers using driving simulator technology.

This study is a double-blind, placebo-controlled mixed design study, including randomized between-subjects comparison of the effects of alcohol intoxication and both between- and within-subjects examination of acute and residual effects at approximately 24 and 48 hours following one-time alcohol administration.

Initial contact with potential participants will be made by telephone, where study personnel will conduct a telephone screen for eligibility. Those telephone screened as eligible will attend CAMH for an eligibility assessment. Enrolled participants will complete four sessions on consecutive days: a practice day, an alcohol administration day, and a 24-hour and 48-hour post-alcohol session.

Inclusion Criteria:

• Males and females aged 19 to 25.
• Reported consumption of at least 1 heavy drinking episode (according to NIAAA criteria of 5 drinks for males and 4 for females within an occasion) in the 6 months prior to eligibility assessment.
• Held a valid class G or G2 Ontario driver's license (or equivalent from another jurisdiction) for at least 12 months.
• Willing to abstain from alcohol use for the duration of the study, and for 48 hours prior to Session 2.
• Provides written and informed consent.

Exclusion Criteria:

• Taking medications or have any medical condition for which alcohol is contraindicated
• Is a regular user of medications that affect brain function (i.e., antidepressants, benzodiazepines, stimulants).
• Diagnosis of severe medical or psychiatric conditions.
• Meets criteria for current or lifetime Substance Use Disorders (DSM-IV) with the exception of nicotine.
• Meets criteria for Alcohol Dependence (DSM-IV)
• Is pregnant, is trying to become pregnant, or is currently breastfeeding.
• Severe allergic reaction to citrus.