Detection of Cannabis Impairment With ISBRG's SpotLight-THC

Inclusion Criteria: * Adults aged at least 18 years old * Must self-report use of cannabis at least once a month * Has held a valid driver's license at least 12 months * Must be willing to abstain from using cannabis and alcohol for 24 hours prior to each session * Must be willing to abstain from all other drugs not medically required for duration of the study (beginning 24 hours prior to the screening visit) * Must be able to drive without special or non-standard equipment * Must be able to meet study time commitment * Provides written and informed consent Exclusion Criteria: * Diagnosis of severe medical or psychiatric condition (as judged by study physician) * Evidence of substance use disorder as reflected by total scores on DUDIT and AUDIT * Regular user of medication that may affect cognitive functioning and/or driver performance (e.g., antidepressants, benzodiazepines, stimulants, opioids) as judged by study physician * Family history of schizophrenia or other psychotic disorder (or taking medications for such) * Pregnant or test positive for pregnancy, looking to become pregnant, or breastfeeding * Respiratory or pulmonary disorder that would negatively affect ability to inhale and hold the cannabis dose * Recent (past 6 months) head injury or stroke, or current symptoms from prior head injury or stroke * History of heart disease, angina, heart attack, heart surgery, or myocardial infarction (or taking medications for such) * Untreated/Untreatable vision or auditory issues (because testing currently requires both senses) * History of suicidal behaviors in past two years * Excessive tobacco use (more than 10 cigarettes a day or 3 or more cigars or pipes per day) * Excessive caffeine use (6 or more servings per day) * Excessive alcohol (14 or more drinks per week) * Regular use of pain medications other than OTC * Use of prescription drugs not prescribed to them or illicit drugs other than cannabis * History of substance abuse or substance addiction * Expressed interest in or participation in drug abuse treatment in past 60 days * Currently diagnosed cannabis use disorder * History of negative reaction to cannabis * Extreme scarring on fingertips that prevents use of the device * Participation in night shift work